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prove 3cos theta - cos3theta

  1. prove 3cos theta - cos3theta = 2cos theta cos2theta + 4sin theta sin 2theta
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    2. Cindy asked by Cindy
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  2. Hello! I have this problem:x(dx)/sqrt(9-x^2) I was wondering why I can't use trig substitution and substitute sqrt(9-x^2) for
    1. answers icon 1 answer
    2. Lucy asked by Lucy
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  3. (Sin theta+ sin3theta + sin5theta)÷ (cos theta + cos3theta +cos 5theta)= tan3theta
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  4. (Sin theta+ sin3theta + sin5theta)÷ (cos theta + cos3theta +cos 5theta
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  5. Which is the parametric form of the polar equation r=-3thetaA.x=3thats cos theta Y=3theta sin theta B.x=-3theta cos theta
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  6. 8sin^2theta+10 sin theta cos theta =3cos^2 theta=0 then general solution for theta is
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    2. Sneha reddy asked by Sneha reddy
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  7. I don't understand how to do this type of question? If 9cos^2 theta +3cos theta=0, where 90 degrees <theta<180 degrees, what is
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    2. Sandy asked by Sandy
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  8. find all values of theta in the interval 0<theta<360 that satisfy the equation 3cos 2theta + 2 sin theta+1=0
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    2. Jade asked by Jade
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  9. Find all values of theta in the interval 0 <= theta < 360 that satisfy the equation 3cos(2theta)=7cos(theta). Express answers to
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    2. Waldo asked by Waldo
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  10. 1)Use the definitions sin0(theta) = y/r, cos0(theta) = x/r and/or tan0(theta) = y/x to prove thatcot0(theta) = 1/tan0(theta)
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    2. abeer asked by abeer
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