Evaluate :

`2/4 times ( Cos^2theta - Sin^2theta )`

Evaluate : Sin^6theta + Cos^6theta = 1 - k Sin^2theta Cos^2theta , find k

The value of Sin^4 theta+Cos^4 theta+2 Sin^2 theta Cos^2 theta is: Sin^4 theta+Cos^4 theta+2 Sin^2 theta Cos^2 theta का मान है:

Evaluate: int cos2 theta ln((cos theta+sin theta)/(cos theta-sin theta))d theta

If 4 tan theta =3 , evaluate ((4 sin theta - 2cos theta +3)/(4 sin theta +2 cos theta -5))

If 4 tan theta = 3, evaluate ((4 sin theta -2 cos theta+3)/(4 sin theta + 2cos theta-5))

Show : Sin^4theta - Cos^4theta = Sin^2theta - Cos^2theta

Prove that : cos^(4)theta - cos^(2)theta = sin^(4)theta - sin^(2) theta

If tan theta=(12)/(13), evaluate (2sin theta cos theta)/(cos^(2)theta-sin^(2)theta)

If 3 tan theta =4 , "evaluate "(3sin theta + 2 cos theta)/(3 sin theta - 2 cos theta ).