If cos(t)=(-7/8) where pi

4,795 questions, page 22
  1. Trigonometry

    Γ is the circumcircle of triangle ABC with radius 12√2. If 9cos(∠B+∠C)cos∠A=−1, what is the value of BC?

    asked by Shin on May 21, 2013
  2. Math

    verify: sin^3 x - cos^3 x = (sinx+cosx)(1-sinxcosx)

    asked by Anonymous on January 25, 2011
  3. MATHS - URGENT

    Write the expression in terms of sine only. 8(sin 2x − cos 2x)

    asked by Shane on May 21, 2013
  4. pre-cal

    verify the identity... cot(-a)cos(-a)+sin(-a)=-csc(a)

    asked by Anonymous on February 2, 2011
  5. maths

    dy/dt = -t^3y^2-ty^2 dx/dt=(sin t)/(cos t+10) dy/dx -3y/x =x^3cosx Which differential method should be used for each equation?

    asked by s17 on March 2, 2017
  6. Opt math URGENT

    prove that : cos^3(θ)sin^2(θ)=1/16[2cos(θ)-3cos(θ)-5cos(θ)]

    asked by Rabin on August 9, 2016
  7. math 12

    Could you please show me how to solve this question.If 2 cos A-1=0, where 0< or = A < 2pi what is A equal to?

    asked by Tori on March 19, 2010
  8. Pre Calculus

    Verify the identity: cos x + sin x tan x = sec x.

    asked by Kim on March 23, 2011
  9. Math

    Evaluate the identity (cos^2x-sin^2x)/(1-tan^2x)=cosx^2X

    asked by Katelyn on March 30, 2011
  10. trig

    How do you solve cos(2arcsin 1/4) using inverse trig. functions??!! PLEASE HELP ME!

    asked by Tor on May 9, 2011
  11. trig

    find sin if cos(2è)=(4)/(5) and theta terminates in quadrant 1

    asked by Anonymous on May 9, 2011
  12. Pre-Calc

    cos^3 = (1/2 cosx)(1+cos2x) Please make the left match the right.

    asked by Amy on January 24, 2018
  13. Math

    Rewrite in terms of an expression containing only cosines to the power 1. 4 cos^6x

    asked by Sarah on March 17, 2013
  14. calculus

    Use the Table of Integrals to evaluate the integral (x sine(6x^2)cos(7x^2)dx)

    asked by ali on February 14, 2010
  15. Trig

    Rewrite cos(tan^-1(v)) as an algebraic expression in v. Can someone help me with this problem? Thanks

    asked by Jennifer on May 15, 2011
  16. calculus

    find the lim cos 2x/(5 + x) as x approaches pos. inifinity

    asked by dee on February 14, 2010
  17. Math

    Transform to a Cartesian Equation: a. x = sin t y = cos t b. x = t^(1/3) -1 y = t^2 - t --- This is what I have for B so far: y = t(t-1) t = (x+1)^3 y = (x+1)^3[(x+1)^3-1] = (x^3 + 3x^2 + 3x + 1)[x^3+3x^2+3x] ...??? and IDK about A. Help? Thank you so

    asked by Anonymous on February 11, 2010
  18. math (differential equation)

    show that y sub n=cos(ncos^-1(x)) satisfies the differential equation: (1-x^2)(d^2y/dx^2)-x(dy/dx)+n^2(dy/dx)=0

    asked by shoosh on March 3, 2013
  19. math

    f(t) = \int_0^t \frac{x^2+11 x+24}{ 1+\cos^2(x)} dx At what value of t does the local max of f(t) occur? t = ?

    asked by Anonymous on June 29, 2015
  20. maths

    how can i find a general solution of g(x)when they give me g(X) =cos (x+30)and g(X)= -2sinx

    asked by mazandie Magaduzela on March 26, 2013
  21. Math

    A simplified version of the expression 2sinθ (cos θ)(cotθ) is

    asked by TeeKay on October 13, 2014
  22. precalculus

    find the exact value: cos^-1 (square root of 2 divided by 2)

    asked by john 2020 on March 8, 2010
  23. math

    In triangle ABC if

    asked by ashley on April 18, 2011
  24. math

    In triangle ABC if

    asked by ashely on April 18, 2011
  25. Algebra 1

    In triangle ABC ,if

    asked by Maram on April 19, 2011
  26. math

    In triangle ABC ,if

    asked by Maram on April 19, 2011
  27. math

    how do I find the sin, cos, and tan of -60 degrees without using a calculator?

    asked by chris on December 14, 2008
  28. maths period help

    find the period cos(theta/4) step plz

    asked by weryiyemi on March 18, 2017
  29. trig help

    verify that cos(A-B)/cosAsinB=tanA+cotB is an identity

    asked by sam on April 14, 2008
  30. trigonometry

    How to verify this identity: 1+ tan x (over) = secant x sine x + cos x

    asked by Debi on February 24, 2010
  31. math

    find the sum cos^2(j) + sin^2(j), if j = p/3 -do I have to use a pythagorean identity?

    asked by Matt on January 24, 2016
  32. pleeaasee hellpp!!

    if sin A= the square root of eleven over 7, find the value of cos 2A.

    asked by Please Answer :) on May 26, 2010
  33. Trigonometry

    evaluate cot 2x = 5/12 with 0

    asked by David on November 28, 2013
  34. trig

    find cos(θ)ˏsin(θ)ˏtan(θ), if cot (2θ)=5/12 with 0≤2θ≤π Answer this Que

    asked by Anonymous on November 27, 2013
  35. Math Analysis

    Find the exact value of cos(x/2) if sin x = 3/4 and x is in quadrant II. ==> I got ã(4-ã7)/2. Is this correct?

    asked by Emily on May 3, 2010
  36. Maths

    Solve for x: 5sin(2x) + cos(x) = -1.916 Can someone please show me the steps?

    asked by Claire on October 17, 2010
  37. math

    verify, 1+csc - 0 ---------- = sec0 cos(-0)+cot(-0) 0 is angle.

    asked by am on October 17, 2010
  38. Trigonometry

    Prove that (3cos^2x + 8sinx-8/cos^2x) = (3sinx-5/sinx+1)

    asked by Trig on November 9, 2008
  39. math !!

    solve the equation for the interval 0

    asked by Amy on September 6, 2008
  40. math

    Use logarithmic differentiation to find the derivative of the function. y = (cos 2x)x

    asked by mat on April 5, 2014
  41. math, trig

    What is the exact value of the cos of 23pi/12? (Twenty-three pi over 12, which is = to 345 degrees.) Thank you

    asked by roger on April 26, 2010
  42. calculus

    Prove that cos(sin inverse x) = square root ( 1-x^2)

    asked by Samantha on September 29, 2010
  43. calculus

    Prove that cos(sin inverse x) = square root ( 1-x^2)

    asked by Samantha on September 29, 2010
  44. Calculus

    Find the derivative. g(x)=cos(x^6) Isn't the answer -6xsin(x^6)

    asked by George on September 27, 2008
  45. Trig

    given that sinx=3/4 and cosy=-5/13 and both x and y are in quadrant II, find the exact value of cos(x-y)

    asked by Blaire on March 2, 2014
  46. Math

    Given cot u=2/5 and cos v=-3/5 find tan(u+v) assume 0

    asked by Blaire on March 2, 2014
  47. Physics, math

    What is the answer to this? I don't understand how to solve it. 1.2 = 4.6 tan 50 - 4.9 (4.6^2)/(x^2 cos^2 50)

    asked by Taylor on September 27, 2015
  48. Calculus

    Can someone help me to integrate by substitution the indefinite integral: (sinx)/ (1+cos(^2)x)?

    asked by Em on July 24, 2010
  49. Calculus

    (sin(47))^2 + (cos(43))^2 = With the correct number of significant figures.

    asked by jim on August 24, 2010
  50. maths trigonometry

    Expand the following using compound angle formulae Sin(m-n) Cos(p-55)

    asked by amanda on January 16, 2017
  51. Math

    f(x) = cos(x) + 3x Find f^-1 (1) and (f^-1)' (1) f^-1 (1) = 0 (f^-1)' (1) = 1/3 These are the answers given, but I also don't understand how my teacher got these.

    asked by Dave on December 5, 2016
  52. Math

    Simplify the expression csc@cos@tan@. What is the best way to solve this?

    asked by V on September 5, 2010
  53. Math

    Solve this multiple-angle equation. cos x/2 = -(sqrt3)/2

    asked by Anonymous on October 18, 2015
  54. Calculus

    Find dy / dx by implicit differentiation. 2sin(9x)cos(3y)=3 dy/dx=_____

    asked by Starfallen on October 25, 2010
  55. Trig

    If sec A =5/4 and A is an angle in Quadrant IV, find the value of cos A. A. -4/5 B.4/5 C.-5/4 Is it choice A

    asked by Kiki on April 26, 2014
  56. Trignometry

    Write the complex number in the form a=bi √(3)(cos π/3 + isin π/3)

    asked by yes on July 2, 2013
  57. Calculus

    show the following linearization of the function f(x)=cos(3x)-3sin(3x) at x=2pi

    asked by Jay on April 7, 2010
  58. trig, math

    Which of these functions has period 7? A)y= cot 7/pi x B)y= tan pi/7 x C)y= sin 7/pi x D)y= cos pi/7 x

    asked by John on July 1, 2013
  59. Calculus

    Find the equation of the tangent line to f(x)=sec x - 2 cos x at (pi/3, 1).

    asked by Anonymous on August 30, 2015
  60. Calculus

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

    asked by Anonymous on October 15, 2018
  61. Trig

    Determine the frequency of y = 2 - 3 cos 10x. (nearest tenth) Please help

    asked by Kay on December 31, 2010
  62. Math Trigonometry

    Given w=2+2i and v=−5√3+5i, vw^2 can be expressed as r*(cos(α∘)+i*sin(α∘)), where r is a real number and 0≤α≤360. What is the value of r+α?

    asked by Crow on June 21, 2013
  63. trig

    Find all real numbers in [0, 2π) that satisfy the equation. cos 2x = √(2)/2

    asked by tony on June 17, 2013
  64. trig

    Given that cos A = 5/13 and A and B are both acute angles, calculate the value of Sin2A and Cos2A

    asked by uche on June 6, 2014
  65. trig

    simplify the expression. (sin^2x+cos^2x) - (csc^2x-cot^2x)

    asked by trig on July 14, 2013
  66. trig

    simplify the expression. cos^2x+sin^2x/cot^2x-csc^2x

    asked by tony on July 14, 2013
  67. Algebra 2

    Find the period and the amplitude of the periodic function. y=-4 cos 8x

    asked by Austin on May 19, 2014
  68. Math

    The point (5,-2) in on the terminal side of an angle t. Find cos

    asked by Brandon on November 16, 2016
  69. calculus

    Find the derivative r '(t) of the vector function r(t).

    asked by Mike on April 20, 2010
  70. Trigonometry

    Solve the following equation tan (2x)+ sec (2x) = cos (x)+ sin (x) Thanks for your help

    asked by Tommy on July 24, 2008
  71. PreCalc

    Verify the Identity. cos^4xcsc^2x = csc^2x + som^2x - 2

    asked by Brit on November 1, 2017
  72. calculus help

    find the derivative of the function. integral cos(x) to sin(x) ((ln(8+3v))dv)

    asked by Kevin on May 1, 2014
  73. 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
  74. Math

    If x is an angle in the first quadrant and cscx = 3 find the exact value of cos 2x

    asked by Nicole on April 15, 2010
  75. precalc

    solve in degrees 1) 2sin2 (x/4) = 1 2) 2 cos (3x) + 1 = 0 3) cot2 (x + 18°) = 1 4) (1 + tan(x + 87°)) / 2 = 7

    asked by yani on October 27, 2015
  76. Algebra 2

    Find the exact value of cos 315 degrees. answers: 3/2, -1/2,2/2, -2/2

    asked by Pam on May 19, 2014
  77. Trigonometry

    Verify the identity: cos x + sin x tan x = sec x.

    asked by CJ on January 13, 2011
  78. trig

    if cos(theta) equal -3/4 find sin(2theta)

    asked by Anonymous on September 1, 2011
  79. pre cal

    show that 6+6sin X is equivakent to --------- - 7 cos x 6cos x ------------ -7(1- sin x)

    asked by colleen on February 16, 2009
  80. Math

    use the unit circle to prove that tan(x/2) = (sin(x))/(1+cos(x))

    asked by Zack on December 12, 2012
  81. math

    how do I do this? I think I have to simplify it? (sin^2ө + cos^3ө/sinө + cosө)+ sinөcosө

    asked by maggie on February 12, 2009
  82. Math

    y = 4 cos (3/4) θ a. amplitude = 4 b. number of cycles = ? c. period = (8pi/3)

    asked by Anonymous on May 25, 2018
  83. calculus - identities

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

    asked by Amber on October 16, 2009
  84. Calculus

    maximum and minimum of y = cos(x) + sin (x)on the interval [0,2pi]

    asked by Mark on October 25, 2009
  85. amth

    Solve the multiple-angle equation. cos x/2 = - squareroot 3/2

    asked by elise on July 11, 2016
  86. calculus

    find the derivative of y=cos pix/sinpix+cospix

    asked by vicki on October 9, 2011
  87. Pre Calculus

    Find the exact value ofcos (u+v) given that sin u= 7/25 and cos v=−12/13. (Both u and v are in Quadrant II.)

    asked by Jessica Maths on July 11, 2016
  88. trig, precalc, math, algebra, trigonometry

    Rewrite: tan(cos^−1 (v)) as an algebraic expression in v. Please help me understand.

    asked by Veronica on May 5, 2016
  89. calculus-derivatives

    y=cos^3(12theta) find derivative using chain rule

    asked by hailey on September 27, 2011
  90. maths

    Express sin 2x cos 4x as a sum of trigonometric functions

    asked by tom on December 24, 2012
  91. maths

    Express sin 2x cos 4x as a sum of trigonometric functions.

    asked by laura on December 23, 2012
  92. Calculus

    Which of the following functions does not have a derivative of zero? A. y=-1/100 B. y=4(pi)^2-9 C. y=sin^2x+cos^2x D. y=cscxtanxcosx E. All do

    asked by Anonymous on December 1, 2014
  93. Calc

    find F''(pi/3) f(x)= 4cos(x/2) i got -cos(pi/6) but i don't think that's the correct answer... Thanks!

    asked by Lilly on September 11, 2011
  94. TRIG

    THE SIN COS SEC TAN COT CSC 5X+Y=0

    asked by NAUDIA on September 20, 2011
  95. trig

    Use a half-angle formula to find the exact value of cos 5ð/12

    asked by Steve on December 16, 2009
  96. Trigonometry

    Prove that sin(n+1)Asin(n+2)A + cos(n+1)Acos(n+2)A = cosA

    asked by Kewal on December 30, 2011
  97. Trigonometry

    Prove that sin(n+1)Asin(n-1)A + cos(n+1)Acos(n-1)A = cos2A

    asked by Kewal on December 30, 2011
  98. calculus

    Find any critical numbers of the function h(x)=sin^2(x)+cos(x) 0 < x < 2π

    asked by Anonymous on October 30, 2012
  99. trig

    cos t=.7, tan t

    asked by Marni on November 27, 2011
  100. Trig

    Find all real numbers that satisfy the equation. 2 cos x + 1 = 0

    asked by Anonymous on November 1, 2011

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