[" If "sin theta+sin2 theta+sin3 theta=sin alpha" and "],[cos theta+cos2 theta+cos3 theta=cos alpha," then "theta" is "],[" equal to "]

If sin theta+sin2theta+sin3theta=sin alpha and cos theta+cos 2theta+cos3theta=cos alpha , then theta is equal to

If sin theta+sin2theta+sin3theta=sin alpha and cos theta+cos 2theta+cos3theta=cos alpha , then theta is equal to

If sin theta+sin2theta+sin3theta=sin alpha and cos theta+cos 2theta+cos3theta=cos alpha , then theta is equal to

If sin theta+sin2theta+sin3theta=sin alpha and cos theta+cos 2theta+cos3theta=cos alpha , then theta is equal to ................. A) (alpha )/(2) B) alpha C) 2 alpha D) (alpha )/(6)

cos theta+sin theta=cos2 theta+sin2 theta

If sin theta _1+ sin theta _2+ sin theta _3=3 " then " cos theta _1 + cos theta _2 + cos theta_3 =

Let f_(n)(theta)=(sin theta+sin2 theta+sin3 theta++sin n theta)/(cos theta+cos2 theta+cos3 theta++cos n theta)

sin theta+sin2 theta+sin3 theta=1+cos theta+cos2 theta

(sin3 theta-sin theta sin^(2)(2 theta))/(sin theta+sin2 theta cos theta)=cos x then x=