`cos5theta=acostheta+bcos^3theta+cos^5theta+d`

If cos5theta=acos^5theta+bcos^3theta+ccostheta then c is equal to

If cos5theta = acostheta +bcos^2theta + c.cos^5theta =d , then

If cos 5theta=a cos theta + b cos^(3)theta+c cos^(5) theta+d , then

If cos 5theta=a cos theta+ b cos^(3) theta+c cos^(5)theta+d , then

If cos 5theta=a cos theta+ b cos^(3) theta+c cos^(5)theta+d , then a. a=20 b. b=-30 c. a+b+c=2 d. a+b+c+d=1

If cos5 theta=a cos theta+b cos^(3)theta+c cos^(5)theta+d then the value of log _(d-b)(5ac) is equal to

cos 3theta+cos 5theta+cos 7theta+cos 9theta=4 cos theta cos 2theta cos 6theta .

If cos theta+cos7 theta+cos3 theta+cos5 theta=0, then theta=

Prove that : (sin theta + sin 3theta + sin 5theta)/(cos theta + cos 3theta + cos 5theta) = tan 3theta