Let `f(theta) = sinthetaxx sin(60^@ + theta) sin(60^@ - theta)`, then

Prove that sin theta sin(60^(@)-theta) sin(60^(@)+theta)=1/4 sin3theta .

Let f(theta)=sin theta(sin theta+sin3 theta)* then

Let f(theta)=sin theta(sin theta +sin 3 theta). " Then " f(theta)

Let A (theta)= ((sin theta,i costheta),(icostheta, sin theta)) , then

Let f(theta)=sin theta(sin theta+sin3 theta), then f(theta)(A)>=0 only when theta>=0(B)>=0 for all real theta (C) >=0 for all real theta(D)<=0 only when theta<=0

If sin (30 ^(@) - theta) = cos (60 ^(@) + phi) , then

Let f(theta)=sin theta(sin theta+sin3 theta)* Then f(theta) is (a) >=0 only when theta>=0(b) =0 for all real theta(d)<=0 only when theta<=0