[sin(theta)/(2)sin(7 theta)/(2)+sin(3 theta)/(2)sin(11 theta)/(2)=],[[" (A) "sin7 theta cos3 theta," (B) "cos7 theta sin5 theta," (C) si "]]

Prove that sin((theta)/(2))sin((7 theta)/(2))+sin((3 theta)/(2))sin((11 theta)/(2))=sin2 theta sin5 theta

sin""(theta )/(2)* sin""(7 theta )/(2) + sin""(3theta )/(2) * sin""(11 theta )/(2) - sin 2 theta sin 5 theta =

Prove that sin (theta)/(2) sin"" (7 theta)/(2) + sin ""(3theta)/(2) sin ""(11 theta)/(2) = sin 2theta sin5 theta .

sin ((theta) / (2)) sin ((7 theta) / (2)) + sin ((3 theta) / (2)) sin ((11 theta) / (2)) = sin (2 theta) sin (5 theta)

2(1-2sin^(2)7theta)sin 3 theta=

(sin3 theta+cos3 theta)/(cos theta-sin theta)=1+2xx sin2 theta

If sin 6theta = sin 4theta - sin 2theta , then theta =

Let f_(n)(theta)= 2 sin . (theta)/(2) sin. (3theta)/(2) + 2 sin.(theta)/(2) sin. (5theta)/(2) + 2sin. (theta)/(2) sin. (7 theta)/(2) + ... + 2 sin (2 n+1) (theta)/(2), n in N , then which of the following is/are correct ?

Let f_(n)(theta)= 2 sin . (theta)/(2) sin. (3theta)/(2) + 2 sin.(theta)/(2) sin. (5theta)/(2) + 2sin. (theta)/(2) sin. (7 theta)/(2) + ... + 2 sin (2 n+1) (theta)/(2), n in N , then which of the following is/are correct ?

Let f_(n)(theta)= 2 sin . (theta)/(2) sin. (3theta)/(2) + 2 sin.(theta)/(2) sin. (5theta)/(2) + 2sin. (theta)/(2) sin. (7 theta)/(2) + ... + 2 sin (2 n+1) (theta)/(2), n in N , then which of the following is/are correct ?