1. Math

    1) Find the angle of depression from the top of a lighthouse 250 feet above water level to the water line of a ship 2 miles off shore. arc tan 10560/250 = 88.64 ft Is this correct? 2) A passenger is in an airplane flying at n altitude of 10 kilometers sees

    asked by Abby on February 18, 2010
  2. math please help

    A (4,3) B (3,-3) c (-4,5) Find the slope of AB, BC, and AC. Find the tangent of each angle and their angle measure (inv. tan) using: tan of an angle =m2-m1/1+m1m2 m2 being the slope of the terminal side (measuring counterclockwise) the triangle looks like

    asked by hw on February 8, 2011
  3. trigonometry

    Find all the angles between 0 degrees and 360 degrees which satisfy the equations a. 8 cos x sin x = sin x b. 5 tan^2 y + 5 tan y = 2 sec^2 y.

    asked by lindsay on April 21, 2012
  4. precalculus

    Write each expression as sine, cosine, or tangent of an angle. Then find the exact value of the expression tan 50-tan20/1+ tan 50 tan20

    asked by ama on July 1, 2012
  5. Math

    sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),cos(2theta),tan(2theta) exactly sin(2theta) cos(2theta) tan(2theta) sin(2theta) would it be 2 x (8/17) cos(2theta) would be 2 x (15/17) tan(2theta) would be 2 x (8/17 divided by 15/17)

    asked by Sally on November 14, 2014
  6. Calculus 12th grade (double check my work please)

    1.) which of the following represents dy/dx when y=e^-2x Sec(3x)? A.3e^-2x sec(3x) tan (3x)-2e^-2x Sec(3x)

    asked by anon on March 7, 2011
  7. Calculus PLEASE check my work ,

    1.) which of the following represents dy/dx when y=e^-2x Sec(3x)? A.3e^-2x sec(3x) tan (3x)-2e^-2x Sec(3x)

    asked by anon on March 12, 2011
  8. math

    use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I have found)and the symmetry of the graphs of sin,cos and tan to find the exact values of sin(-pi/6), cos(5pi/3) and tan (4pi/3). I know that sin -(pi/6) = -1/2 and cos (5pi/30 = 1/2 and

    asked by jenny on August 24, 2011
  9. trig

    1. if sin 2A = Psin2B, prove that tan(A+B)/tan(A-B)=P+1/P-1.

    asked by seema on June 14, 2011
  10. trignometry

    show that cos2x=1-tan^ 2 x /1+tan^2x=2cos^2x-1

    asked by help me out it's urgent on October 6, 2012
  11. Math

    Help prove this identitiy tan(pi/4+x)+tan(pi/4-x)=2sec2x

    asked by Gifty on January 4, 2009
  12. trignometry

    1. if sin 2A = Psin2B, prove that tan(A+B)/tan(A-B)=P+1/P-1.

    asked by seema on June 13, 2011
  13. maths

    If the roots of the quadratic eqn x²+px+q=0 are tan 30° and tan 15° respectively, then the value of 2+q-p is-

    asked by jha on July 5, 2014
  14. agl 2

    rewrite: tan 4 X + tan 2 X/ 1 - (tan4X)(tan2X)

    asked by jan on June 26, 2012
  15. precal

    Why is there no corresponding point on tan^-1(x) for the (135,-1) on the graph tan(x). Thanks!

    asked by jen on January 6, 2011
  16. Pre Calculus

    Verify the following identity 2 tan x/1+tan^2 x = sin 2x

    asked by Joe on April 12, 2010
  17. TC

    If Tan (A+B)=1/3 and Tan(A-B)=2/5,then prove that A.Tan2A=11/13 B.Tan2B=-1/17

    asked by Rabinprakash Dahal on September 1, 2015
  18. math

    If Tan (A+B)=1/3 and Tan(A-B)=2/5,then prove that A.Tan2A=11/13 B.Tan2B=-1/17

    asked by Gunda on May 8, 2017
  19. Maths

    If Tan (A+B)=1/3 and Tan(A-B)=2/5,then prove that A.Tan2A=11/13 B.Tan2B=-1/17

    asked by Rabinprakash Dahal on September 1, 2015
  20. math

    Prove that Sin x + tan x / 1+cosx =tan x

    asked by lindsay on May 19, 2013
  21. basic maths trignometry

    prove that secx - tanx = 1 -tan x/2 /1 + tan x/2

    asked by kabir on July 28, 2016
  22. Trig Proofs

    Please solve this proof Tan(pi/4 +x)+ Tan(pi/4+x)= 2Sec2x

    asked by Kim on April 27, 2009
  23. Math

    trigonometric identities tan^2Ө/sin^2Ө-1=tan^2Ө

    asked by Melissa on May 27, 2015
  24. Trig

    True or false? tan x = tan(x-6pi)

    asked by Jay on January 23, 2013
  25. maths

    if tan^2x=1-e^2, prove that secx+tan^3x cosecx = (2-e^2)^3/2

    asked by krishan on June 18, 2012
  26. Physics

    so I'm doing the back of this worksheet and on the bottom there's a list of a whole bunch of formulas... I'm asked to find the minimum coefficent of friction if the road was flat of a car which I still don't know how to do and posted a question about it

    asked by HELP ME! on May 11, 2009
  27. Trigonometry

    Verify the identities please. 1.) TAN(X+π)-TAN(π-X)= 2 TAN X 2.) SIN(X+Y)+SIN(X-Y)= 2 SIN X COS Y

    asked by AwesomeGuy on February 21, 2013
  28. Trigonometry

    Verify the identity algebraically. TAN X + COT Y/TAN X COT Y= TAN Y + COT X

    asked by AwesomeGuy on February 17, 2013
  29. Pre-Calculus

    Given cos A = -3/5, π

    asked by Anonymous on October 24, 2018
  30. calculus

    find functions f(x) and g(x) so that f(g(x))= sqrt(tan(3x^2 - 7)) Would this work??? g(x)= 3x^2 -7 f(x)= sqrt(tan(x))

    asked by Blake on October 12, 2010
  31. Calculus

    How do I calculate the following? tan−1(tan(8)) − tan−1(tan(4))

    asked by Anonymous on October 18, 2015
  32. Calc

    how do i begin to solve this? integral of (1/x^2)sec(1/x)tan91/x)dx I tried substituting tan(1/x) for u but i couldn't get it to work...

    asked by Katie on February 27, 2010
  33. Trig

    4tan^2u-1=tan^2u 3tan^2u=1 tan^2u=1/3 sq. root of (tan^2u)=sq. root of (1/3) tanu=sq. root of (3)/3 tanu=sq. root of 1 Did I do this one right? If not, could you please show me the correct method?? Thanks!

    asked by Tara on January 9, 2010
  34. trigonometry help me

    6.Prove that tan y cos^2 y + sin^2y/sin y = cos y + sin y 10.Prove that 1+tanθ/1-tanθ = sec^2θ+2tanθ/1-tan^2θ 17.Prove that sin^2w-cos^2w/tan w sin w + cos w tan w = cos w-cot w cos w 23.Find a counterexample to shows that the equation sec a – cos

    asked by eddy on January 2, 2013
  35. trignonmetry

    6. Prove that tan λ cos^2 λ + sin^2λ/sin λ = cos λ + sin λ 10. Prove that 1+tanθ/1-tanθ = sec^2θ+2tanθ/1-tan^2θ 17.Prove that sin^2w-cos^2w/tan w sin w + cos w tan w = cos w-cot w cos w 23. Find a counterexample to shows that the equation sec

    asked by yoshi on December 16, 2012
  36. Pre-Cal

    Find sin 2x, cos 2x, and tan 2x from the given information. [1]. sin x = 8/17, x in Quadrant I 1). sin 2x =________. 2). cos 2x =________. 3). tan 2x =________. [2]. sin x = -5/13, x in Quadrant III 1). sin 2x =________. 2). cos 2x =________. 3). tan 2x

    asked by Amber on July 7, 2016
  37. spanish

    please check these questions: En la clase de español, los estudiantes van a escribir una _____." a. capítulo b. ejercicio c. composición d. informe D "¿Tomaste la prueba y el examen?" "Sí, _____ tomé." a. lo b. la c. los d. las (i need help on this

    asked by spanish on April 24, 2009
  38. math help

    What is the distance Y Z in metres between the boat and the bouy, to 2 significant figures? A surveyor, standing at an observation point on a cliff top of a height 300m above sea level, can see a boat and a bouy out at sea, both directly in front of him.

    asked by claudia on May 18, 2007
  39. physics

    In Physics, it is important to use mathemat- ical approximations. For instance, in a small angle approximation, tan α ∼ sin α . Find the largest angle α for which the dif- ference of sin α − tan α is less than 3.52% of the sin α value.

    asked by ryan on June 28, 2011
  40. math

    prove cos(x+y) / cos(x-y) = (1-tan x tan y)/(1+tan x tan y)

    asked by Yuni on December 10, 2011
  41. Maths

    Please help me.Iam stuck. Find all the possible values of theta between 0 degree and 360 degree for the following quadratic equation. State the quadrants in which each angle lie. 8 tan^2 theta + 2 tan theta=15

    asked by Shane on May 6, 2013
  42. Maths

    Please help me.Iam stuck. Find all the possible values of theta between 0 degree and 360 degree for the following quadratic equation. State the quadrants in which each angle lie. 8 tan^2 theta + 2 tan theta=15

    asked by Shane on May 6, 2013
  43. Please help me with Trig

    Given cos 67.5° = [√(2+√2)]/2, find tan 67.5° , simplify where needed, and show work. I'm starting to learn this stuff, and I'm so confused where to start. I know they gave me the coordinate X as in cos 67.5° = [√(2+√2)]/2, and I also know that

    asked by Jane on January 27, 2016
  44. maths

    Q)If sin x=12/13 then find the value of the following in fraction: 1)3 tan x - cos x 2)5 sin x - 4 tan x 3)2 sin x - cos x + tan x

    asked by humza on March 4, 2017
  45. math

    Could someone please help me answer this Prove tan(-theta) = -tan(theta)

    asked by Seven on August 7, 2010
  46. Radicals and Trig.

    I am catching up over summer on math units that I have to rewrite. In my textbook it asks me to find the base of two triangles and add them together. the smallest angle of the larger triangle is 30 degrees. The opposite side to the angle is 40cm. it gives

    asked by SummerHomework on July 25, 2012
  47. precalc

    Given that sec 3π/10 ≈ 17/10 and csc 3π/10 ≈ 17/14, find the following: 1. sin 3π/10 ≈ 14/17 (is this one correct) 2. csc 43π/10 ≈ 3. sec 2π/10 ≈ 4. cot -12π/10 ≈ 5. tan π/5 ≈ 6. sin -7π/10 ≈ 7. cos 13π/10 ≈ 8. tan -33π/10 ≈ i

    asked by a on September 16, 2015
  48. maths

    Please I need help.Show full working out. (a) sin x cot x= cos x (b) (1 + tan theta)^2 + (1- tan theta)^2 = 2sec^2theta

    asked by Shane on May 6, 2013
  49. Trigonometry

    How do you verify the equation is an identity? Tan^2x-tan^2y=sec^2x-sec^2y and, how do you factor and simplify, cscx(sin^2x+cos^2xtanx)/sinx+cosx

    asked by Jasmine on January 3, 2010
  50. Math

    prove sin2x+cos2x+1 tan(pi/4+x) ______________ = __________ sin2x+cos2x-1 tanx so what I did tan(x) (1+cos(2x)+sin(2x)=tan(pi/4+x) (-1+cos(2x)+sin(2x)

    asked by Lana on November 26, 2015
  51. trig

    Prove that tan4x=(4tanx-tan^3x)/(1-6tan^2 x+tan^4 x) *note: the exponents are just numbers. there are no variables in the exponents.

    asked by Anne on March 27, 2010
  52. Math

    tan 39°=40/AP, So AP =40/tan. in triangle AQP, angle Q= 60/sin 91°=AP/SinQ. Then bearing of Qfrom P = 30° 180°-(91 angle Q).

    asked by Vin Mwale on February 13, 2018
  53. math

    Using taylor series solve lim x→0 ((sin^-1 6x)-(sin 6x))/((tan^-1)(6x)-(tan 6x) I don't know how to start this problem

    asked by johnson on November 23, 2015
  54. trig

    Solve the following equation for È

    asked by Anonymous on December 18, 2011
  55. fundamental trigonometric indentities


    asked by Anonymous on February 11, 2011
  56. maths (trigonometry)

    if sec x +tan x=p, then tan xeuqalto what. How?

    asked by marley on June 8, 2011
  57. Math

    Verify: tan^2a=sec^2a tan^2a-1

    asked by Anonymous on May 4, 2017
  58. math

    prove that tan(π/4+x/2)+tan(π/4-x/2)=2sec x

    asked by abcd on October 8, 2016
  59. math

    Prove: 2cos^2(x)-1 = 1-tan^2(x)/ 1+tan^2(x) Thank you!

    asked by Beatriz on January 4, 2010
  60. pre-calc

    (1+tan x)^2= 2 tan x+2 please show all work

    asked by Haley on November 20, 2012
  61. math

    The maker of a candy that comes in the color Blue, Red, White, Green, Pink and Tan. The proportion for Blue is 0.2, Red is 0.3, White is 0.1, Green is 0.2, Pink is 0.1 and Tan is 0.1. A single candy is drawn at random. Find the probability that a candy has

    asked by Ana wheeler on October 18, 2012
  62. solving trigonometrical equations

    arctan(tan(2pi/3) thanks. arctan(tan(2pi/3) = -pi/3 since arctan and tan are inverse operations, the solution would be 2pi/3 the number of solutions to arctan(x) is infinite, look at its graph. generally, unless a general solution is asked for, or a domain

    asked by Jen on April 10, 2007
  63. math

    how do I simplify these? 1. (Cot/1-tan) + (Tan/1-Cot) - Tan - Cot 2. (1+cos) (csc-cot)

    asked by kayla on February 10, 2009
  64. Trigonometry

    how do i evaluate this? 1+tan 200(degrees) tan 80(degrees)/tan200(degrees)-tan 80(degrees)

    asked by Liv on October 15, 2016
  65. Basic math

    if tan alpha =1/3 and tan beta =1/7 prove that tan(2 alpha+beta)=45 degrees

    asked by Anonymous on January 22, 2017
  66. Trig.......

    I need to prove that the following is true. Thanks (2tanx /1-tan^x)+(1/2cos^2x-1)= (cosx+sinx)/(cosx - sinx) and thanks ........... check your typing. I tried 30º, the two sides are not equal, they differ by 1 oh , thank you Mr Reiny I'll tell my teacher

    asked by abdo on April 18, 2007
  67. verifying identities

    how do you veriy tan x + Cot y -------------- = tan y + cot x 1-tan x cot y sin^4x + cos^4x = 1- 2cos^2x + 2cos^4

    asked by Dizzytrig on July 22, 2008
  68. Precalculus

    Prove that the left side equals the right side Tan + sec -1 / tan -sec + 1 = tan + sec

    asked by Anonymous on April 18, 2014
  69. maths-trignometry

    Prove that tan-1 (1/7) + tan-1 (1/13) = tan-1(2/9)

    asked by anoynomous on March 16, 2013
  70. Maths

    Find tan(3 theta) in terms of tan theta

    asked by Jake on February 12, 2007
  71. English

    What point is Tan making with the example of her mother and the hospital in Mother Tongue by Amy Tan 1990?

    asked by Nick on January 28, 2013
  72. trigonometry...........

    Prove the following identity:- (i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx

    asked by MATHS on June 11, 2011
  73. trig

    Solve the equation 2 tan C - 3 = 3 tan C-4 algebraically for all values of C in the interval 0 degrees

    asked by Anonymous on February 8, 2012
  74. mathematics

    evaluate each of the following..sin 130.tan 60/cos 540.tan 230.sin 400

    asked by Jossie on March 21, 2013
  75. calculator question.. please answer ASAP

    how do i type in tan^2 or cos^2 on the calculator?.. everyime i press tan or cos, parentheses automatically come up with it

    asked by Anonymous on March 5, 2008
  76. trig

    give the exact real number value without using a calculator sin[(cos^-1)(1/4)] sin[(tan^-1)(3/4)+(tan^-1)(12/5)]

    asked by billy on April 14, 2008
  77. math

    Another: theta is a second quadrant angle in standard position and tan theta = - (sqrt5)/(2) . Find the exact value of cos theta. I assume I use the equation 1 / cos(theta)^2 = 1 + tan (theta)^2 However how does this work out algebraically?

    asked by Adam on March 31, 2013
  78. spanish

    i need help on this: "Rebeca dice que no tiene que estudiar para el examen." "Yo, sí. No soy _____ ella." a. tan alta como b. tan inteligente como c. mayor que d. más deportista que thanks!

    asked by spanish on April 24, 2009
  79. math

    The point (5,-6) is on the terminal arm of the standard position angleӨ. Determine the smallest positive measure of Ө in radians. It's in the fourth quadrant so tan is negative? tan(-6/5) how can that be positive? Thanks in advance.

    asked by sh on June 16, 2009
  80. English

    How does setting contribute to emotional effect in "Two Kinds" by Amy Tan? For this, I wrote that the setting of Chinatown is reminiscent of China and the pain and squalor that Jing-Mei's mother escaped from. Is this correct? I also need some more details

    asked by student on September 18, 2017
  81. Calculus

    How do I find the critical values? y= 4/x + tan(πx/8) What I did is I simplified it to y= 4x^-1 + tan(πx/8) then I took the derivative y'= -4x^-2 + (π/8)(sec(πx/8))^2 Then I simplied it y'= -4/x^2 + (π/8)(sec(πx/8))^2 then I found a common denomiator

    asked by John on September 24, 2013
  82. Physics

    An item is shot off the ground at a force of 31N and an angle of 36 degrees. In order to find the vertical force, would I use SIN, COSINE, or TANGENT? would it go 31 * COS/SIN/TAN (36) or 36 * COS/SIN/TAN (31)??

    asked by Sarah on March 13, 2010
  83. Math

    Simplify the follow)ing to the simplest form (tan(x) +cot(x))/ (tan(x)*cot(x))

    asked by Sandra on January 29, 2017
  84. calculus

    Evaluate the limit as x approaches 0 of [tan(x+Δx)-tan(x)] /Δx: sec^ 2 (x) cot (x) sec (x) does not exist

    asked by ashley on February 6, 2014
  85. Math

    tan 46.27 = x / (y+100) could someone change this to y = ? I tried it but got stuck after the first step of moving y+100 over to tan... steps too please

    asked by Amy~ on May 15, 2011
  86. math


    asked by hasee on April 4, 2013
  87. math

    prove (tan^3x/1 tan^2x) (cot^3x/1 cot^2) = (1-2sin^2x cos^2x)/sinx cosx

    asked by pankaj on October 5, 2017
  88. Precalculus

    Solve for the equation in the given domain. (tan theta)(sec theta)=tan theta theta E{real numbers of degrees} BY THE WAY, REMIND ME IF THIS IS THE CORRECT WAY TO FIND THE ANGLE OF... sec theta=2 To find the angle do you set it up like this?? 1/(cos^-1)(2)

    asked by Anonymous on November 17, 2013
  89. Precalculus Follow Up

    1+ cos(theta)/Cos(theta) = tan^2(theta)/sec(theta)-1 I am having trouble understanding how this is verified by the previous answer. I am sorry I just want to understand this because I didn't see a tan^2 anywhere :/. Step by step how did you verify the

    asked by George on October 29, 2012
  90. science-physics

    You walk 15 m south and 35 m east. Find the magnitude and direction of the resultant displacement both graphically and algebraically. What's the ° (counterclockwise from east)?? Well I tried using tan=15/35 the degrees ended up being 23 degrees which was

    asked by ashley on October 18, 2007
  91. Physics- Mechaincs

    A home run is hit such a way that the baseball just clears a wall 27 m high located 147 m from home plate. The ball is hit at an angle of 37◦ to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1 m above the ground.

    asked by Genevieve on September 17, 2010
  92. Math

    If 0

    asked by House on October 3, 2008
  93. Math

    In triangle PQR, angle Q= 90 degrees, angle P= 60 degrees and angle R= 30 degrees. PR= 1 unit. Extend side QR to T such that PR= RT. Join PT. Calculate the exact measure of angle T. Determine the exact value of lengths needed to find tan T and then find

    asked by Kausar on February 23, 2017
  94. math trigg.

    which triangles do you use COS SIN or TAN?? You can use these relations on any ANGLE. THe sin, cos, and tan are dependent on the angle, it does not matter if the angles are in triangles, or if they are, what kind of triangle. Right triangles are especially

    asked by shelby on June 18, 2006
  95. trig

    how to prove ; tan 10 degrees + tan 70 degrees - tan 50 degrees = sqrt 3

    asked by victor_hery on August 31, 2012
  96. trigometric identities

    Establish identity: tan theta + cot theta -------------------- equal to(=) csc²theta tan theta Can you draw the ans. bec. I cant understand which they are aligned.

    asked by Alyn on January 14, 2015
  97. Calculus

    find the area between x=tan^2y and x=-tan^2y in -pi/4

    asked by Bethany on March 28, 2016
  98. Geometry

    Given: KL ║ NM, LM = 45, m∠M = 50° KN⊥NM, NL ⊥ LM Find: KN and KL So I drew it found that m∠K=90°, m∠LNM=40°, m∠KNL=50° using the rules of trigonometry, I got: (NL/45) =tan(50°) and that NL=53.63 I checked it and it was correct so using

    asked by Anonymous on October 27, 2018
  99. math

    find tan 30 degrees and tan 45 degrees using the 45-45-90 triangle therom and 30-60-90 triangle theorm

    asked by joan on March 25, 2013
  100. math

    Calculate the value of the following, without using a calculator, leaving answers, where necessary, in simplified surd form: (a). sin 120° + tan 300° (b). tan 315° × cos330° / sin(-240°) × sin 570°

    asked by Gilbert on October 14, 2018