" (iii) "16cos^(5)theta-20cos^(3)theta+5cos theta=cos5 theta

Prove that 16 cos ^(5) theta - 20 cos ^(3) theta + 5 cos theta = cos 5 theta.

Prove that cos 50 = 16 cos^(5)theta - 20 cos^(3) theta + 5 cos theta

The maximum value of 16cos^(5)theta-20cos^(3)theta+5cos theta is

cos theta+cos7 theta+cos3 theta+cos5 theta=0

Solve cos2theta+cos8theta=cos5theta

Prove that: a) cotthetacot(60^(@)-theta)cot(60^(@)+theta)=cot3theta b) cos5theta=16cos^(5)theta-2thetacos^(3)theta+5costheta c) sin4theta=4sinthetacos^(3)theta-4costhetasin^(3)theta

Prove that: a) cotthetacot(60^(@)-theta)cot(60^(@)+theta)=cot3theta b) cos5theta=16cos^(5)theta-2thetacos^(3)theta+5costheta c) sin4theta=4sinthetacos^(3)theta-4costhetasin^(3)theta

If cos5 theta=a cos^(5)theta+b cos^(4)theta+c cos^(3)theta+d cos^(2)theta+e cos theta then which of the following is incorrect? (i)a=16(ii)b=5(iii)c=-20(iv)e=

Solve :cos theta+cos3 theta+cos5 theta+cos7 theta=0

cos5 theta=a cos theta+b cos^(3)theta+cos^(5)theta+d