1. Optional mathematics

    Prove that (3-4sin^2A) (1-3Tan^2A)= (3-tan^2A) (4cos^2A-3)

    asked by Alina maharjan on July 14, 2017
  2. maths

    Prove that (2√3+3)sinx+2√3cosx lies between -(2√3+15) and (2√3+15)

    asked by krishan on June 18, 2012
  3. advanced function

    pls. help: prove the identity sin2x+sin2y=2sin(x+y)cos(x-y)

    asked by justme on November 29, 2011
  4. Math - Trig - Double Angles

    Prove: cos4x = 8cos^4x - 8cos^2x + 1 My Attempt: RS: = 4cos^2x (2cos^2x - 1) + 1 = 4 cos^2x (cos2x) + 1 LS: = cos2(2x) = 2cos^2(2x) - 1 = (cos^2(2)) - cos^2(2x)) - 1 ----- Prove: 8cos^4x = cos4x + 4cos2x + 3 My Attempt: RS: = cos2(2x) + 4cos(2x) + 3 =

    asked by Anonymous on November 17, 2007
  5. Calculus

    Sketch the region enclosed by the curves given below. Decide whether to integrate with respect to x or y. Then find the area of the region. y=4cos(x),y=4−8x/π. I thought it was the integral of 4cos(x)- the integral of 4- 8x/π on the interval 0 to π/2.

    asked by Kevin on April 27, 2016
  6. calculus - identities

    prove this identity: sec(y) - cos(y)= tan(y)sin(y) THANK YOU!!

    asked by Amber on October 16, 2009
  7. Trigonometry

    Verify Identity: cos5x-cos3x=-8sin^2x(2cos^3x-cosx)

    asked by Erik on July 2, 2011
  8. trig

    (sec^2x-1)(csc^2x-1)=1 prove the following identity ive been stuck on this for hours please help

    asked by Anonymous on February 22, 2013
  9. precalc

    prove the identity : cos3x =4 cos^3x-3cosx

    asked by Anonymous on March 6, 2018
  10. precalc

    use power reducing identities to prove the identity sin^4x=1/8(3-4cos2x+cos4x) cos^3x=(1/2cosx) (1+cos2x) thanks :)

    asked by skye on August 16, 2012
  11. Pre-Calc/Math

    Prove Identity: (1-cos2x/ tan x) = sin2x

    asked by Yadira on May 14, 2012
  12. Math

    a) prove the identity: Ax(BXC)=B(A*C)-C(A*B) A,B,C vectors x- cross product *-dot product b) use part a) to prove that cross product is not associative.

    asked by larry on October 31, 2014
  13. maths

    prove that cos3x+sin3x/cos x-sin x=1+2sin2x

    asked by sunny on July 22, 2009
  14. Math

    Prove the identity: sec^4x - tan^4x = 1+2tan^2x

    asked by Shane on November 10, 2014
  15. Calc III

    Express the volume of the solid that the cylinder r = 4cos(theta) cuts out of the sphere of radius 4 centered at the origin with a triple integral in cylindrical coordinates. I have already found the intervals, but I cannot solve it. The bounds are

    asked by Anon on November 2, 2016
  16. Math

    Prove the identity cos3x ≡ 4cos^3x - 3cosx Thank you so much for the help!

    asked by Autumn on December 6, 2018
  17. trig

    By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx

    asked by Rin on December 13, 2011
  18. Pre Calculus

    Prove that 2/square root 3cosx-sinx=sec(pi/6-x)

    asked by Nathan on April 22, 2010
  19. Trig

    prove the identity (sinX)^6 +(cosX)^6= 1 - 3(sinX)^2 (cosX)^2 sinX^6= sinx^2 ^3 = (1-cosX^2)^3 = (1-2CosX^2 + cos^4) (1-cosX^2) then multiply that out 1-2CosX^2 + cos^4 - cosX^2 + 2cos^4 -cos^6 add that on the left to the cos^6, and combine terms..

    asked by JungJung on December 8, 2006
  20. Maths

    Prove that cos3x/cosx-cos6x/cos2x=2(cos2x-cos4x)

    asked by Joel on July 28, 2016
  21. Trig

    Prove the following functions: (sinx+sin2x)/(1+cosx+cos2x)=tan x (cos3x/sinx)+(sin3x/cosx)=2cot2x tan2x=(2/cotx-tanx) theses are due in the am. Fastness would be great?

    asked by jared on November 7, 2011
  22. Algebra

    Question : Determine whether each of the following given sets is a group with respect to the indicated operation. Show your work. (b) The set E of all even integers with operation addition. My work : So I was working on above part (b) Following is an

    asked by Ashley on May 9, 2020
  23. Trigonometry

    Prove it is an identity. (sin^2x)/(tanx)=sinxcosx

    asked by . on April 19, 2010
  24. Maths

    Prove that the identity element e of a group G is unique.

    asked by Santosh on July 30, 2011
  25. Precalculus with Trigonometry

    Prove or disprove the following identity: cos (x+pi/6) +sin (x-pi/3) = 0

    asked by Natalie on April 7, 2013
  26. Calculus

    Prove the identity and give its domain. 4sinxcosx+sin4x=8sinxcos^3x

    asked by Courtney on February 6, 2008
  27. trig

    By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx

    asked by Rin on December 13, 2011
  28. maths...

    Differentiate ln [x+√(x^2+1)] with respect to x hence evaluate limit 0 to 1 ∫ 1/√(x^2+1) dx _________________________________________ Use the identity cos3x=4cos^3x-3cosx, find ∫cos^3x dx * Is there a printing error in the question? the limit is

    asked by Aoi on June 19, 2009
  29. maths

    find the value of x if sin2x+3cosx=2 then cos3x+sec3x is

    asked by rajagopal on September 6, 2017
  30. trig

    how do you verify cos3x=4cos^3x-cosx???

    asked by lindsey edler on July 12, 2005
  31. math

    Prove the identity: cos^4(x)-sin^4(x)=1-2sin^2(x).with explanation im confused on this one cause of the 4th power of the sine. does this mean that we put it in the calculator 4 times? and what exactly does it mean by prove the identity- does it mean like

    asked by Anonymous on April 15, 2012
  32. pre-cal

    find all solutions in interval [0,2pi] tan²x = -3/2 secx This question may look tricky, but its actually quite simple. First: rearrange the pythagorean identity tan²x+1=sin²x so that it reads tan²x=sin²x-1 Then replace the tan²x in the original

    asked by ethan on May 16, 2007
  33. Trig

    verify the following identity: 2sinxcos^3x+2sin^3cosx=sin(2x)

    asked by Lynn on July 19, 2012
  34. trigonometry

    Prove: sin3x-sinx/cos3x-cosx=-cot2

    asked by Dini on November 2, 2010
  35. trig--power reducing formulas

    Having trouble with this problem: Rewrite the expression as an equivalent expression that does not contain powers greater than 1. Cos³x My answer: cos³x=(cos²x)(cosx) =(1+cos2x/2)(cosx)-->cos+cos³x/2...which is wrong

    asked by Brian on April 20, 2009
  36. Calculus exam review, PLEASE HELP!!

    for each function, determine the equation of the tangent line to the graph for the indicated value of the variable. a) y = 3cosx + 4sinx + 1 , when x = pie b) y = x - 3cosx , when x = (5pie)/3

    asked by stephanie on June 21, 2012
  37. Math help please

    Prove this identity using the product-to-sum identity for sine: sin^2 x=1-cos(2x)/2

    asked by Kyle on April 5, 2016
  38. Math

    Prove That Cos3A = 4Cos A - 3Cos A

    asked by Gabriel Gad on April 23, 2019
  39. TRIG

    Verify the following identity. 1) sin(x+y) __________ = tanx+tany cosxcosy 2) Write cos3x in terms of cosx I cannot figure out how to solve for identities they are so hard. Any help appreciated!:)

    asked by ALISON on October 23, 2011
  40. trig

    sin^4 x = (3-4cos 2x + cos4x)/8 prove on one side please!

    asked by Rachel on February 23, 2009
  41. math

    Prove that:(3-4sin^2A) (1-3tan^2A)=(3-tan^2A)(4cos^2A-3)

    asked by Rishabh on October 13, 2014
  42. Trig

    Prove (cos^2t+4cos^2+4)/(cost+2)=2sect+1)/sect

    asked by Katie on March 3, 2012
  43. Math

    Select all the true statements about identities. A) You may use proven identities to prove other identities. B) An identity is true only for restricted values of the variables. C) You can prove an identity by graphing the side to the left of the equal

    asked by TeeKay on October 14, 2014
  44. trig

    prove that the equation 2sin x cos x +4cos^2 x =1 may be written in the form of tan^2 x -2tan x -3=0

    asked by Nus on January 3, 2015
  45. CALC

    I did post it wrong. sin(4x)/sin(x)=4cos(x)cos(2x). Verify the identity, please explain!

    asked by JD on August 13, 2011
  46. calc

    sin(4x)/sin(x)=4cos(x)cos(x) verify the identity

    asked by jessica on August 13, 2011
  47. Trigonometry

    Need help solving problems using the Trigonometric Identities: 8cos^4 thet=cos4theta+4cos2theta+3 I am a bit unsure how to solve it. I am aware that the first step I must take is to simplify the problem and then use the Product to Sum formula Nasty one!

    asked by sierra on April 23, 2007
  48. Child Development

    Rachel is a highechool student who has explored several employment and education alternatives. She has chosen to attend the community college near home to become a diesel mechanic. What is the identity status of Rachel according to James Marcia? A.

    asked by Jessica on May 20, 2014
  49. Math - Trigonometry

    In order to prevent confusion that may be caused by reading this problem written through keyboard text, I have written the identity in microsoft paint here: gyazo. com/3afe07a6067e467d3776dd8b64ccac91 I need to find three different ways (Different meaning

    asked by Monika on March 15, 2018
  50. Math - Trigonomotry

    Hello! In order to prevent confusion that may be caused by reading this problem written through keyboard text, I have written the identity in microsoft paint here: gyazo. com/d4529f091e5ba75c09a9a283201504d2 I need to find three different ways (Different

    asked by Monika on March 14, 2018
  51. algebra

    Give am example of a function f.N N with the property that there exists a function g. N N such that the composition got is the identity function on N but for no function h. N N does it hold that fog is the identity function on N.Prove all claims

    asked by geeta on February 27, 2014
  52. math

    1. Prove the identity:cosx/1-tanx+sinx/1-cotx=sinx+cosx 2.Prove the identity: cosx/1+sinx+1+sinx/cosx=2secx

    asked by Aliya on August 20, 2011
  53. trig

    Write an equation for simple harmonic motion, given that the amplitude equals 4 inches and the period equals 2 seconds and the max displacement occurs when t=0. answers: y=4sin pi t, y=4cos pi t, y=4cos t, y=4sin2 pi t

    asked by Kayla on May 17, 2012
  54. English

    Hi I am writting an essay on a book called 'Funny Boy' I have to answer this question: Selvadurai raises questions about the nature of identity—national, familial, sexual, postcolonial, ethnic, racial—and how the suppression of one’s burgeoning or

    asked by Mary on March 31, 2010
  55. circular (trigonometric) functions

    hi, i need help solving this trigonometric equation: sinx+3cosx=0 i don't know what to do as i can't just diviide the two to create tanx which is what i have been doing in previous questions... yes, you are on the right track sinx = -3cosx sinx/cosx = -3

    asked by elle on April 14, 2007
  56. trig

    cos(sin^-1 x)=sq rt(1-x^2) prove the identity

    asked by Emily on April 2, 2012
  57. Pre-Calculus

    Prove the identity: cos(x-π/2)=sin x

    asked by Adrian on November 12, 2014
  58. Trigonometry

    Prove the identity sin(x+y+z)+sin(x+y-z)+sin(x-y+z)+ sin(x-y-z) = 4 sin(x)cos(y)cos(z) This identity is so long and after i tried to expand the left side and it just looked something crap Thanks for you help :)

    asked by Tommy on July 19, 2008
  59. Math pre cal

    prove the following identity cos^4X - sin^4X = 1-2sin^2X

    asked by Breanna on September 28, 2009
  60. Pre-Calc !!!

    Prove the identity. 2tanx/1+tan^2x=sin^2x

    asked by Josh on April 16, 2012
  61. Math

    How do you prove this identity? cos2x*tan(π\4-x)= 1-sin2x

    asked by Branco on February 5, 2020
  62. math

    Prove the identity (sinx+cosx)^2 = 1+sin2x Thank you

    asked by Bear on January 28, 2015
  63. Prove trig identity

    Prove the following trigonometric identity: (sec^2x-1)(csc^2x-1)=1

    asked by Randy on January 9, 2011
  64. math

    please help me on the following: prove the identity. cos4x = 1-8sin^x2cos^2x

    asked by John on March 1, 2010
  65. trig

    sinx+sinxcot^2x=cscx prove each identity

    asked by tom on June 24, 2011
  66. MATH

    prove the identity: cos(x)*csc(x)*tan(x)=1

    asked by Alisa on November 6, 2014
  67. math

    please help me on the following: prove the identity. cos4x = 1-8sin^x2cos^2x

    asked by John on March 1, 2010
  68. Trigonometry

    Prove the identity. 6cos^2(x)-1 -12cos^4(x) +8cos^6(x)= cos^3(2x) Thanks for your help :)

    asked by Tommy on July 18, 2008
  69. Math

    prove the identity: sin^2 O/ 1-cos O = 1+cosO O= theta

    asked by amber on April 27, 2012
  70. Math

    Prove the identity: cosx/1-tanx +sinx/1-cotx

    asked by Aliya on August 20, 2011
  71. precalc

    prove the identity (1 + tan x) / sin x = csc x + sec x

    asked by clarice on October 13, 2015
  72. PreCalculus

    Prove the following to be an identity (cotx + cscx)*(1-cosx)=sin x

    asked by Kevin on October 15, 2017
  73. Calculus

    prove if an identity csc (x)-cot (x)=sin (x)/1+cos(x)

    asked by Anonymous on October 15, 2018
  74. pre calc

    prove identity cscx-(cosx)(cotx)=sinx

    asked by logan on November 29, 2010
  75. Math

    Prove identity Cot⭕sin⭕sec⭕= 1 How would i do this one please help me. Thankyou

    asked by Kristien on February 23, 2013
  76. Math

    Required to Prove the following trig identity: (cos2x)^2 + (sin2x)^2 = 1

    asked by Halle on June 18, 2009
  77. math trigonometry

    Prove the identity Sin^3X sinx*cos^2X=tanx/cosX

    asked by happy on June 9, 2015
  78. math trigonometry

    Prove the identity Sin^3X+sinx*cos^2X=tanx/cosX

    asked by happy on June 9, 2015
  79. trig

    Prove the identity. (must work with left side) (1-2sin(x)^2)=(cos(x)^2)

    asked by mailon on September 4, 2008
  80. math

    prove the following trigonometric identity: (cos x/(1+sinx))+tanx = secx

    asked by Liz on March 12, 2008
  81. Pre-Calc/Math

    Prove identity: (sec x/csc x) + (sin x/cos x)=(2/cot x)

    asked by Yadira on May 14, 2012
  82. math

    sinx+ siny/ (cosx+cosy)= tan 1/2 (x+y) prove this identity

    asked by JK on August 13, 2010
  83. math

    prove the identity cos x/sec x-tan x=1plus sin x

    asked by laston on December 13, 2016
  84. gr 12. advanced functions

    Trig identity Prove: cos2x tan(pie/4 - x) ------- = 1 + sin2x

    asked by avm on November 21, 2009
  85. Math

    Prove the identity csc^2x = 2sec2x / sec2x - 1 Sorry i really tried. I got : LS = 1 - (cos^2x/sin^2x) but that's it. please help

    asked by Nihira on June 17, 2014
  86. maths

    If f(x)=x(2pi-x) in 0

    asked by Rahul on September 9, 2012
  87. Math

    Prove this identity. State any restrictions on the variables. sin x/(tan x)= cos x

    asked by Emily on December 9, 2010
  88. Math (PreCalculus)

    How do I prove the following identity? sec^2x-1 (division line)> -------- = (tanx)(secx) (sinx)

    asked by Charli on February 3, 2015
  89. Math (pre-celc 12)

    I need to prove this identity: cot(x)+tan(x)=csc(x)sec(x) I get as adding them together, but then I get stuck.

    asked by Jana on June 17, 2016
  90. Precalculus

    2-3cosx=5+3cosx 0 degrees is less than or equal to x less than or equal to 180 degrees Can you please show me step by step in detail. Please do not skip a step. Thanks!

    asked by Jess on August 6, 2011
  91. Trigonometry

    For all values of x for which the expressions are defined, prove the following equation identity 2/sec = 2-2 sin^2 x/ cos x

    asked by Anna on March 17, 2016
  92. precalculus

    Sin(x+y)cos(x-y)= 1/2sin2x+ 1/2 sin2y Help please I have no idea how to do this because my math class never did it but while making the final review for the chapter I was assigned, I put this one in it. They are going to all ask me how to do it.

    asked by Dustin on January 15, 2015
  93. Math- gr.12 Trig.

    Hi, could someone explain to me how to use a counterexample in trig to prove whether something is either an identity or equation? For ex. how would you do that with this question? sec^2x-tan^2x= cos x

    asked by May on January 11, 2010
  94. ah trig help

    use an apropriate sum or difference indentity to prove the double-angle identity cos2u=1-2sin2u

    asked by amber on April 26, 2011
  95. trig

    determine wheather each of the following is an identity or not prove it 1. cos^2a+sec^2a=2+sina 2. cot^2a+cosa=sin^2a

    asked by Anonymous on March 20, 2011
  96. Math

    Prove the identities 1. cos3Ɵ + cos Ɵ = 4cos^Ɵ - 2 cos Ɵ 2. sin (A+B)sin (A-B)=cos2B + sin^2 A-1

    asked by Anonymous on October 25, 2012
  97. Physics

    Given below are the some of the function of x and t to represent the displacement (transverse or longitudnal ) of an elastic wave . State whether it is stationary or travelling wave or none of them. (i) y = 3sin(5x+0.5t) + 4cos(5x+0.5t) (ii) y =

    asked by Raj on December 2, 2016
  98. Pre Cal

    could someone please tell me what the other angle identity of tan is? Thank you much! "...other angle identity of tan x"? in relation to which "other" ? there are many identities dealing with the tangent. The most important is probably tan x = sin x/cos x

    asked by Marie on May 23, 2007
  99. MathS triG

    1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B) 2.1Prove that sin2A+2cosA-2cos^3A/1+sinA =sin2A 2.2 for which values of A in the interval[-360;360] is the identity in 2.1 undefined? 3.If tanB=3/4 , 0

    asked by OwamIII on April 8, 2014
  100. maths Pls help trig

    1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B) 2.1Prove that sin2A+2cosA-2cos^3A/1+sinA =sin2A 2.2 for which values of A in the interval[-360;360] is the identity in 2.1 undefined? 3.If tanB=3/4 , 0

    asked by tshepo on April 8, 2014