1. trigonometry

    1) Find the exact value of the expression: tan−1(tan(−120651/47π))... How do you find Tan(-120651/47pi)? I don't know how to find exact values, if it's not a recognizable value. 2)Find a simplified expression for tan(sin−1(a/5))... Because tan = y/x

    asked by Dan on May 3, 2015
  2. Math(Please help)

    1)tan 5 degrees + tan 25 degrees / 1 tan 5 degrees tan 25 degrees = sqrt 3 / 3 Am I correct? 2) Complete the identity tan^2Q - 3sinQtanQsecQ = -2tan^2Q Correct?

    asked by Hannah on March 10, 2010
  3. Math(Please help)

    1)tan 5 degrees + tan 25 degrees / 1 tan 5 degrees tan 25 degrees = sqrt 3 / 3 Am I correct? 2) Complete the identity tan^2Q - 3sinQtanQsecQ = -2tan^2Q Correct?

    asked by Hannah on March 10, 2010
  4. Pre-Cal

    1)tan 5 degrees + tan 25 degrees / 1 tan 5 degrees tan 25 degrees = sqrt 3 / 3 Am I correct? 2) Complete the identity tan^2Q - 3sinQtanQsecQ = -2tan^2Q Correct?

    asked by Hannah on March 11, 2010
  5. Pre-calculus help

    I have two problems I am stuck on, if you could show me how to solve the problems it would be much appreciated. 1) Find sin 2x, cos 2x, and tan 2x from the given information. tan x = − 1/6, cos x > 0 sin 2x = cos 2x = tan 2x = 2) Find sin 2x, cos 2x, and

    asked by Holly on April 11, 2015
  6. calculus

    find the integral: ∫tan^6 (x) dx

    asked by rox on June 24, 2012
  7. Pre-Calc (Prove the identity)

    Prove the identity. (show your work please) tan(x − π/4)= (tan x − 1)/(tan x + 1) Thank you!

    asked by Kate on November 20, 2013
  8. pre-calc help !!!!!!!

    1)tan^2x=3 ? 2)tan x sin^2x=tan x ? 3)2cosx sinx - cos x=0

    asked by Haley on November 8, 2012
  9. trig

    Given that tan 45=1, use tan(x+y) to show that tan 22.5= /2 - 1. (/is square root sign

    asked by Mimi on August 24, 2010
  10. math (trigonometry)

    A=170 degree then prove that Tan A/2=-1-rot(1+Tan^2 A)/Tan A

    asked by Binoy kumar mahato on October 23, 2017
  11. Pre-Calc Help!!!

    Prove the identity. (show your work please) tan(x − π/4)= (tan x − 1)/(tan x + 1) Thank you!

    asked by Anonymous on November 22, 2013
  12. math

    the integral of 1x2-5x+14/(x-1)(x^2+9) the answer i got was ln(x-1)-5/3 tan^-1(x/3) however this is not right pleasee help!

    asked by sinead on December 3, 2009
  13. Math

    Could someone explain the steps for this question. Simplify the expression tan(5pi/8)-tan(3pi/8)/1+tan(5pi/8)tan(3pi/8)

    asked by Jake on January 25, 2012
  14. Pre Calculus

    I keep trying to solve this by factring but I can't seem to get! It's so frustrating! The problem is 1+tan2x=0 This is how I worked the problem before: 1+((2tanx)/(1-tan^2x))=0 ((2tanx)/(1-tan^2x))= -1 Then I cross multiplied to get: -1 + tan^2x = 2 tanx

    asked by Jen on April 12, 2013
  15. trig

    please help me with some questions I skipped on a review for our test coming up? solve 5-7 on the interval 0 greater than or equal to x less than or equal to 2pi. 5. sin x=sqrt3/2 6. cos x=-1/2 7. tan x=0 ---------------- 14. what is the exact value of

    asked by BreAnne on February 22, 2012
  16. Math

    tan(-120)= sqrt 3 OR - sqrt 3 (Helper stated that it was sqrt 3) But, I'm just confused over this part: for even vs. odd functions it saids that tan(-angle) = - tan(angle) so the even vs. odd doesn't matter since tan is positive in the QIII?

    asked by Amy on March 2, 2011
  17. calculus

    Find the integral of (tan x)^2 sec(x)dx

    asked by Sara on February 12, 2013
  18. algebra

    How do you do this in your calculator? tan 79=x/150 x= 140 tan 79 Calculators are differnt. Here is my 70 tan x (times key) 150 = And here is a way to let Google do it. Type in the Google search engine 150 tan 79degrees press search thanks

    asked by Wilma on February 13, 2007
  19. Calculus

    int(dx/(x^2+9)) u = x/3 Use the indicated substitution (above) to evaluate the integral. Confirm answer by differentiation. Okay, so I found that du/dx is 1/3. dx is 3du. Just by looking at the integral I can tell this is some form of tan^-1(x), if we

    asked by Nikki on October 23, 2010
  20. Calculus

    The question will first read in English followed by a reading in French. *************************************** If alpha + 2 beta = pi/4 AND tan beta = 1/3. What would tan alpha mesure? (Keep in mind that pi/4 is the same as 45 degrees.) Si alpha + 2 beta

    asked by Melanie on April 30, 2012
  21. Inverse trigonometry

    Prove that- tan^-1(1/2tan 2A)+tan^-1(cotA)+tan^-1(cot^3A) ={0,ifpi/4

    asked by Ash on April 8, 2018
  22. Trig/Geometry

    Wendy spots a pizza delivery car as she is looking down at a 15° angle from the top of her apartment building, which is 145 ft tall. How far away is the car from the base of the building? Round to the nearest hundredth. A. 45.98 ft B. 3.56 ft C. 38.85 ft

    asked by Rothko on May 28, 2015
  23. math

    Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the symmetry of the graphs of sin, cos and tan, to find the exact values of sin -pi/6, cos 5/3pi and tan 4pi/3. I have found the answers to the first three using the special tables sin pi/6

    asked by jenny on August 25, 2011
  24. calculus

    find the indefinite integral: integration of tan^3(7x) dx

    asked by john on June 4, 2010
  25. calculus

    Find the trigonometric integral (a) ∫▒tan⁡〖θ 〖sec〗^4 〗 θ dθ

    asked by Bonaventure on August 12, 2012
  26. trigonometry

    an example problem showed the following log tan A/2 = 9.54435 - 10 A= 38 deg 36' 12" Now i want to do the same. log tan A/2 = 9.85551 - 10 A= ?? I don't know how to convert tan into degrees can you help me.

    asked by Anon on February 28, 2011
  27. Precalculus

    I am trying to submit this homework in but i guess i'm not doing it in exact values because it is not accepting it. I know i'm supposed to be using half angle formulas but maybe the quadrants are messing me up. Please help! Find sin x/2 , cos x/2 , and tan

    asked by J.P. on November 10, 2015
  28. math. PLEASE HELP.

    Question: If A= 29 degrees and a= 4.6, find c. There is a diagram shown in the textbook. b is adjacent, c is the hypotenuse, and a is opposite. I know I'm suppose to use SOH CAH TOA, and i tried using tan, but Im not getting the correct answer. i looked in

    asked by Eunice on November 16, 2016
  29. Math

    1.Write the equation 5x+y-2=0 in normal form. 5x+y-2=0 5x+y=2 (add two to both sides) Standard form (Ax+By=C)---> 5x+y=2 Y-intercept (when x equals 0) 5x+y-2=0 5x+y=2 5(0) +y=2 y=2 X-intercept (when y equals 0) 5x+y-2=0 5x+y=2 5x+0=2 x=2/5 Slope intercept

    asked by Jon on April 25, 2009
  30. Trig - check my answers plz!

    1. (P -15/17, -8/17) is found on the unit circle. Find sinΘ and cosΘ Work: P= (-15/17, -8/17) cosΘ = a value P = (a,b) sinΘ = b value Answer: cosΘ = -15/17 sinΘ = -8/17 2. Should the triangle be solved beginning with Law of Sines or Law of Cosines.

    asked by Piper on February 3, 2009
  31. Grd 12 Math

    Can someone please help me work out how to get to the answer of: tanx + tan (pi-x) + cot (pi/2+x) = tan (2pi-x)

    asked by Jess on November 6, 2013
  32. Pre Calculus.

    Can someone check my answers please!!! Simplify (tan ^2 theta csc^2 theta-1)/(tan^2 theta). My answer: 1 Simplify ((cos x)/(sec x-1)) + ((cos x) /(sec x +1) My answer: 2cot^2 x Find a numerical value of one trigonometric function of x if (tan x/cot x )–

    asked by Austin on April 21, 2009
  33. Pre Cal.

    Evaluate tan(cos^(-1)(ã3/2 )+tan^(-1)(ã3/3))? arccos(sqrt(3) / 2) = pi / 6 arctan(sqrt(3) / 3) = pi / 6 tan(pi / 6 + pi / 6) = tan(pi / 3) = sqrt(3).

    asked by Austin on April 2, 2009
  34. Physics Check My Work Please

    Determine the minimum angle at which a roadbed should be banked so that a car traveling at 20 m/s can safely negotiate the curve if the radius of the curve is 200m. * Data: v=20 m/s r=200m *Formula TAN(theta)=v^2/rg *Solution TAN(theta)=(20

    asked by Jose Luis on December 3, 2015
  35. Please Check My Work: College Physics

    Determine the minimum angle at which a roadbed should be banked so that a car traveling at 20 m/s can safely negotiate the curve if the radius of the curve is 200m. * Data: v=20 m/s r=200m *Formula TAN(theta)=v^2/rg *Solution TAN(theta)=(20

    asked by Jose Luis on December 3, 2015
  36. physics

    Two radar stations A and B, are separated by horizontal distance of (a=500 metres), they both track the position of a plane C by recording angles (alpha), and (beta) at 1 second intervals. time (sec) 9 10 11 the angle A(alpha) 54.80 54.06 53.34 the angle B

    asked by ryan on November 17, 2012
  37. math

    How do I derive the secant reduction rule? Integral (sec x)^n dx = Integral (sec x)^(n-2) * (sec x)^2 dx = Integral ((tan x)^2 + 1)^(n/2-1) * (sec x)^2 dx Doing a substitution with: u = tax x du = (sec x)^2 dx = Integral (u^2 + 1)^(n/2-1) * du At this

    asked by mathstudent on November 8, 2007
  38. math

    tan^-1a+tan^-1b+tan^-1c=pi,yhen prove that a+b+c=abc

    asked by hasee on April 3, 2013
  39. Math (Pre-Calc)

    Find all the solutions of the equation in the interval {o,2pi) 5sqrt3 tan x+3=8sqrt3 tan x

    asked by Fiona on February 8, 2015
  40. trig

    Given that tan B= 7/24 with B in quadrant III, find sin 2B, cos 2B, and tan 2B, using angle identities.

    asked by Ryan on October 12, 2011
  41. Trigonometric

    tan^2 x − 7 tan x − 8 = 0 Use inverse functions where needed to find all solutions of the equation in the interval [0, 2π).

    asked by Diana on March 16, 2015
  42. Math

    Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270º≤B≤360º. Find tan (A + B).

    asked by Molly on October 15, 2014
  43. trig

    if x and y are positive acute angles, tan x=1/3and tan y =1/4, find the value of sin(x-y)

    asked by Anonymous on May 25, 2011
  44. trig

    Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270º≤B≤360º. Find tan (A - B).

    asked by Matt on September 13, 2013
  45. Trig

    Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270º≤B≤360º. Find tan (A + B).

    asked by Anonymous on September 18, 2013
  46. Math; Check my answers please

    1. sin(tan^-1(4/3))=4/5 2. find the angle whose tangent equals 0. tan^-1(cos(pi/2))=0

    asked by Lizzie on January 28, 2014
  47. algebra 2 and trig (math)

    Find the positive acute angle that satisfies the equation tan(squared) minus tan = 0.

    asked by joe on April 26, 2011
  48. Trigonometry

    Could someone please help me with the following q's I'm having some trouble: 1.) cot θ (theta) = 0.791, find sec θ and tan θ 2.) tan θ = 9/40, what is the value sin^2θ + cos^2θ

    asked by Kevin on November 27, 2013
  49. Literature

    These questions regards "Rules of the Game" by Amy Tan. 1. What did Tan find most awarding about the transformation of her work to film?

    asked by Anonymous on February 11, 2014
  50. math

    find to the nearest minute, all positive values in the interval 0° ≤ θ < 180° that satisfy the equation 2 tan^2 θ - tan θ = 3

    asked by Natasha on March 7, 2012
  51. math

    find to the nearest minute, all positive values in the interval 0° ≤ θ < 180° that satisfy the equation 2 tan^2 θ - tan θ = 3

    asked by Natasha on March 7, 2012
  52. Math

    If sin x = -12/13 and tan x is positive, find the values of cos x and tan x.

    asked by Porsha on February 7, 2015
  53. Math

    Prove that cos2x=(1-tan^2x)/(1+tan^2x) I can't find any identities that can help me with this. I'm really confused

    asked by Simon on November 9, 2009
  54. trig

    the question is: given sec x = 4, tan x < 0, find sin(2x), cos(2x)and tan (2x)

    asked by lauren on January 19, 2011
  55. Calculus

    find the derivative: d/dx int_a to x (a being the upper limit) of tan(tan(t))dt

    asked by Elena on April 22, 2011
  56. trig

    How do you find the exact values of sin(u/2), cos(u/2), and tan(u/2) of tan(u)=-5/8

    asked by Kyler on March 3, 2010
  57. Math Trigg

    Find sin 2x, cos 2x, and tan 2x from the given infomation csc x=4, tan x < 0

    asked by Kaylee on March 3, 2014
  58. maths

    If cot¤=7/8,find sin¤, Cos¤,Tan¤,Cosec¤,Tan¤

    asked by puran on April 2, 2017
  59. Trigg

    Find sin 2x, cos 2x, and tan 2x from the given infomation csc x=4, tan x < 0

    asked by Kaylee on March 3, 2014
  60. maths

    If cot¤=7/8,find sin¤, Cos¤,Tan¤,Cosec¤,Tan¤

    asked by puran on March 31, 2017
  61. calculus

    Use the indicated substitution to evaluate the integral integral 18sec(2x) tan(2x)dx, u=2x

    asked by vishal on September 10, 2013
  62. art

    I have an image by Takashi Murakami.that I need a professional opinion for complete a detailed analysis of the image using all the visual elements and principles of design. The image is Tan Tan Bo Puking—a.k.a. Gero Tan (2002).

    asked by Mike on November 30, 2010
  63. trigonometry

    5.Find the complete exact solution of sin x = -√3/2. 10. Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to two decimal places. 12. Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two decimal places. 19.Prove that tan^2a – 1

    asked by Jose on December 16, 2012
  64. Calculus

    s=çdx/(4+5cos x). By using t-substitution, i.e. t=tan(x/2) we get cos x=(1-t^2)/(1+t^2) and dx=2dt/(1+t^2). Substituting in s and simplifying, we get s= 2çdt/4(1+t^2)+5(1-t^2)=2çdt/(9-t^2). Using standard result çdx/(a^2-x^2)=1/a*arctanh (x/a)

    asked by MS on October 30, 2013
  65. MATHEMATICS

    Given that Sin(A+B)=2Cos(A-B) and tan A = 1/3 , Find the exact value of tan B.

    asked by CHRYSTABELLE on June 21, 2011
  66. pre calculus

    Find the exact values: tan(7pi/4) - tan (pi/6)

    asked by Anonymous on March 26, 2014
  67. mathematics

    Given that Sin(A+B)=2Cos(A-B) and tan A = 1/3 , Find the exact value of tan B.

    asked by ceasar on June 21, 2011
  68. calc

    also: integral of tan^(-1)y dy how is integration of parts used in that? You write: arctan(y)dy = d[y arctan(y)] - y d[arctan(y)] Here we again have used the product rule: d(fg) = f dg + g df You then use that: d[arctan(y)] = 1/(1+y^2) dy So, the integral

    asked by marsha on May 23, 2007
  69. Calculus II

    Evaluate using u-substitution: Integral of: 4x(tan(x^2))dx Integral of: (1/(sqrt(x)*x^(sqrt(x))))dx Integral of: (cos(lnx)/x)dx

    asked by RuggedChild on February 24, 2009
  70. Calculus 1A

    I am trying to find: dy/dx for y = sec(tan x) I have the answer, but I have no idea how to get there. I know that the derivative of sec x = sec x tan x and that the derivative of tan x is sec^2 x. But sec doesn't have an x, so ...?

    asked by Mary on March 26, 2013
  71. science

    Sitting on a horizontal track is a mass of 10kg. One end of the track is raised untill the mass just begins to slip. If the coeffieient of static friction is .4 what is the minimum angle at which the mass begins to slip? mgSinTheta = mg*mu*CosTheta

    asked by Henry on August 25, 2006
  72. tan x = 1/2

    Can someone tell me what the radian value is for this number and how they got it? Thanks On a graph plot the point A(2,1) Let C(2,0) be the point on the x-axis x is the angle AOB and tan x = 1/2 Since angle x is not one of the special angles, you will have

    asked by Anonymous on April 3, 2007
  73. physics

    A cyclist in an Olympic race is moving in a circular track of radius 80 m with speed 72 km/h. He has to lean from the vertical approximately through an angle of... ANS: tan-1(1/2) How is tan-1(1/2) derived in this answer?

    asked by JC on December 3, 2017
  74. Calculus II

    Find x and dx using trigonometric substitution of (integral) square root of 4x^2 - 9 divide by x x = 2/3 sec x dx = 2/3 tan x dx Is this right so far?

    asked by Katie on December 31, 2012
  75. trigonometry

    5. Find the complete exact solution of sin x = -√3/2. 9. Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to two decimal places. 21. Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two decimal places. 22. Prove that tan^2a –

    asked by eemily on December 13, 2012
  76. limiting position of the particle

    A particle moves along the x axis so that its position at any time t>= 0 is given by x = arctan t What is the limiting position of the particle as t approaches infinity? Answer is pi/2 How do I solve this? Thanks a lot. You want to find the limit of

    asked by Jen on October 20, 2006
  77. Calculus

    could anybody please explain how sec x tan x - ¡ì sec x tan^2(x) dx = sec x tan x + ¡ì sec x dx - ¡ì sec^3(x) dx What I don't understand about your question is what is ¡ì ? i just want to know if those two equations are equal, if yes, how did one

    asked by Rain on October 16, 2006
  78. trigonometry

    Given that tan A = 2 tan B (B is the symbol for Beta) show that tan (A-B) = sin 2B/3- cos2 Beta.

    asked by lindsay on May 1, 2012
  79. Inverse trigonometry

    Solve the equation tan^-1(under rootx^2+x)+sin^-1(under rootx^2+x+1)=pi/2 Where tan^-1 inverse of tan

    asked by Ash on April 8, 2018
  80. calculus

    5. Find the equation of the tangent line to the graph of f(a) = -sec(a) at the point (0, -1) 6. Differentiate y = sin(x)tan(x). 7. Find f '(x) for f(x) = sin(x)cot(x). 8. Find the derivative of the function f(x) = cos^2(x) + tan^2(x) 9. Find f '(x) for

    asked by gerald on January 15, 2015
  81. math

    how do I solve these? (Tan^2ө)(Cos^2ө)+ (cot^2ө)(sin^2ө) The answer is supposed to be one but I don't know how to get it. 9sec^2ө - 5 tan^2ө The answer is supposed to be 5+4sec^2ө

    asked by kayla on February 9, 2009
  82. trig

    (3 tan^2x-1)(tan^2-3)= 0 can someone please explain how to do this problem and then explain the whole pie thing at the end...like, this is suppose to equal pie/6 b/c it's tan...im soooo confused.....

    asked by help? on October 29, 2011
  83. math

    I have a question I have been working on since yesterday and I am not making this up. I couldn't get the right answer. If sin theta = -2/3, which of the following are possible? A: cos theta= -the sqr rt of 5/3 and tan theta =2/3. B: sec theta = 3/the sqr

    asked by lisa on November 21, 2013
  84. Mathematics

    Use substitution to solve: sec^2x/(tan^2x -1) dx What substitution should I use (what should I let 'u' equal)? I've tried using substitutions for tan or sec, i.e. tan^2x +1 = sec^2x , but I can't get the answer.

    asked by Chloe on April 22, 2016
  85. math

    um take home test...i have no idea what im doing always sometimes never 1. sin2x=2sinx 2. cos (pie/3+x)=-sinx 3. if tan x=3 and tan y=2 then tan (x+y)=5 4. when you use the half angle formulas you choose whether to use a + or - by noting in which quadrant

    asked by allison on June 12, 2006
  86. Math

    1. Evaluate the indefinite integral integral symbol[6x5+2sec(x) tan(x)]dx. 2. Integral symbol 8 at the top, 5 at the bottom 3x2+3x2 dx = Thanks

    asked by Sara on September 19, 2011
  87. TRIG

    what is another form of: sin (A+B) sin (A-B)/ cos^2 A cos^2 B a) cos^2 A - cos^2 B b) tan^2 A - tan^2 B c) tan^2 A - tan^2 B d) sin^2 A - sin^2 B please show the steps you take to get to the answer! thank you

    asked by rossi on November 26, 2010
  88. Pre calc

    Find sin(2x), cos(2x), and tan(2x) from the given information. sin(x) = 5/13, x in Quadrant I sin(2x)? cos(2x)? tan(2x)? I honeslty just need one good example of how to do these please show all work and finalize answer

    asked by Armani on April 13, 2017
  89. trigonometry

    Express as a function : c.tan (810degrees + theta ) I'm confused between two answers . 1. that it would be tan 90 deg (which is undefined) 2. it would be cot theta ?? can you tell me what i should do to get the right answer.

    asked by Anon on February 5, 2011
  90. Pre-Calculus

    A.Verify the identity. B.Determine if the identity is true for the given value of x. Explain. Sec(x) / tan(x) = tan(x) / [tan(x) – cos(x)],x = π I already solved A and I believe it's true; however, I need help with B.

    asked by Iris on October 5, 2016
  91. sgmic

    Prove that tan theta+tan 2theta+tan 3theta=tan theta*tan 2theta*tan 3theta

    asked by radhika pandey on June 16, 2015
  92. Math

    What is a simplified form of the expression [sec^2x-1]/[(sinx)(secx)]? a. cot x b. csc x c. tan x***** d. sec x tan x I think this is the correct answer, but I do not understand why. Can someone please explain?

    asked by girly girl on April 27, 2018
  93. Math/Calculus

    Integrate: (2x^2+5)/((x^2+1)(x^2+4)) I came up with: (tan^-1)(x)-(1/2)((tan^-1)(2/x)) but it keeps coming back the wrong answer even though I integrated correctly. Is there a way to simplify this answer, and if so, how? Your answer is correct, but I think

    asked by COFFEE on May 27, 2007
  94. Calculus

    Th integral of tan(3x)dx

    asked by Anonymous on March 29, 2015
  95. Maths

    I'm done with this question..Can anyone help me? tan^-1(yz/xr) + tan^-1(zx/yr) +tan^-1(xy/zr) = pi/4 Prove that x^2+ y^2+ z^2=r^2

    asked by Suhail on March 11, 2015
  96. Calculus : Derivative

    If tan^-1(x^2-y^2/x^2+y^2) = a, prove that dy/dx = x(1 - tan a)/y(1 + tan a) Please solve!!!

    asked by Akash on June 15, 2011
  97. Math

    Simplify (tan 4X+tan 2x)/(1-(tan 4X)(tan2X))

    asked by Jackson on September 6, 2013
  98. calculus

    Differentiate e^(2x^3+x) X tan(x^2) tan e^x / ln(x^6/2-3x+3e) cos(tan(e^4x^2))

    asked by daria on March 30, 2008
  99. Calculus

    Okay so I have a question on my assignment that says: You are given that tan(y) = x. Find sin(y)^2. Express your answer in terms of x. I know its derivatives, and I've tried taking the derivatives of both etc, and got them both to come out as cos(y)^2,

    asked by Tracy on October 21, 2006
  100. need asap trigg

    simplify the expression by using a double angle formula or a half angle formula: a. 2 tan 7 degrees /1-tan^2 7 degrees b.2 tan 7 theta / 1-tan^2 7 theta

    asked by Kaylee on March 4, 2014