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Solve for theta: cos2theta=1/2

  1. Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, find sin2theta and cos2theta.I'm not sure how to properly square
    1. answers icon 1 answer
    2. Joe asked by Joe
    3. views icon 631 views
  2. Solve for theta: cos2theta=1/2
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    2. Anonymous asked by Anonymous
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  3. tan theta= 15/8 and pi< theta<3pi/2a. Sin(- theta) b. cos2theta c. sin( theta - 3pi/4) d. cos(theta/2) can someone explain to me
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    2. unknown asked by unknown
    3. views icon 2,638 views
  4. prove 3cos theta - cos3theta = 2cos theta cos2theta + 4sin theta sin 2theta
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    2. Cindy asked by Cindy
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  5. show that sin3theta-cos2theta =(1-sin theta)(4sin squared theta + 2sin theta -1)
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    2. victor2 asked by victor2
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  6. show that sin3theta-cos2theta =(1-sin theta)(4sin squared theta + 2sin theta -1)
    1. answers icon 1 answer
    2. victor2 asked by victor2
    3. views icon 481 views
  7. Find sin2theta, cos2theta, and tan2theta for costheta = -12/13 in pi < theta < 3pi/2.My answers: 20111/24336 for tan2theta.
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    2. Anonymous asked by Anonymous
    3. views icon 2,141 views
  8. Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, find sin2theta and cos2theta.I'm not sure how to properly square
    1. answers icon 1 answer
    2. Joe asked by Joe
    3. views icon 523 views
  9. Prove thisCot²(90-theta) /tan² theta-1 + cosec²theta/sec²theta-cosec²theta= 1/sin²theta - cos²theta
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    2. Akash asked by Akash
    3. views icon 680 views
  10. Prove that cos²theta + tantheta cosectheta=cos theta
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    2. Tony asked by Tony
    3. views icon 97 views