Find the sum of the series `sintheta- (sin2theta)/(2!)+(sin3theta)/(3!)-… to oo`

Find the sum of the series costheta- (cos2theta)/(2!)+(cos3theta)/(3!)-… to oo

Solve: sin3theta=sin2theta

Find the sum sintheta+x sin 2theta+x^2sin 3theta+… to oo

Solve 4sintheta sin2thetasin4theta=sin3theta

Sum ot n terms the series sin^3theta+sin^3 3theta+sin^3 5 theta+…

Find the sum of n terms of the series sqrt(1-sin2theta)+(sqrt(1-sin4theta)+sqrt(1-sin6theta)+…

Find the sum to n terms of the series sin^3 theta +1/3 sin^3 3theta+1/3^2sin^3 9theta+1/3^3 sin^3 27theta+…

Find the sum of the series 1+cos^2theta+cos^2thetacos2theta+cos^3 theta cos3theta+… to oo

Sum to terms of the series sintheta sin2theta + sin2thetasin3theta + sin3theta sin4theta +..... is equal to

Find the values of theta , for which cos3theta + sin3theta + (2sin2theta-3)(sintheta-costheta) is always positive.