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PROVE: Cos 2theta = .5

  1. sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),cos(2theta),tan(2theta) exactlysin(2theta) cos(2theta)
    1. answers icon 2 answers
    2. Sally asked by Sally
    3. views icon 1,782 views
  2. Solve tan(40/90) for the double angle cos(2theta). I know I use the x^2 + y^2 = r^2 formula and cos(2theta) = cos^2theta -
    1. answers icon 1 answer
    2. Anna asked by Anna
    3. views icon 658 views
  3. Prove or disprove the following identitysin^4theta - cos^4theta = sin^2theta-cose^2theta
    1. answers icon 1 answer
    2. Jerry asked by Jerry
    3. views icon 502 views
  4. Prove: [(tan^2theta+1)(cos^2theta-1)]=1-sec^2theta
    1. answers icon 1 answer
    2. Blaire asked by Blaire
    3. views icon 517 views
  5. establish identity5csc^2theta-3cot^2theta=2csc^2theta+3
    1. answers icon 1 answer
    2. Anonymous asked by Anonymous
    3. views icon 442 views
  6. What is the integral of 1-tan^2theta from 0 to pi/3?Using the identity tan^2theta=sec^2theta-1, I got my answer to be 2pi/3 -
    1. answers icon 1 answer
    2. Rachel asked by Rachel
    3. views icon 588 views
  7. if cot theta =7/8 , evaluate (1+sin^2theta)(1-sin^2theta)/(1+cost^2theta)(1+co-^2theta)the answer should be 49/64 but i couldn't
    1. answers icon 2 answers
    2. rani asked by rani
    3. views icon 1,073 views
  8. sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),cos(2theta),tan(2theta) exactlysin(2theta) cos(2theta)
    1. answers icon 1 answer
    2. Larry asked by Larry
    3. views icon 2,020 views
  9. Demostrate the validity of tan^2theta-sin^2theta=sin^4theta sec^2theta
    1. answers icon 1 answer
    2. Mb asked by Mb
    3. views icon 861 views
  10. Prove that tan theta+tan 2theta+tan 3theta=tan theta*tan 2theta*tan 3theta
    1. answers icon 1 answer
    2. radhika pandey asked by radhika pandey
    3. views icon 600 views