If `theta =pi/21,` then `(sin 23theta-sin 7theta)/(sin 2theta + sin 14theta)=`

If theta=(pi)/(21), then (sin23 theta-sin7 theta)/(sin2 theta+sin14 theta)=

If theta = (pi)/(21) , then (sin23 theta-sin 7 theta)/( sin2 theta + sin 14 theta)=

If theta = (pi)/(21) , then show that (sin 23 theta - sin 7 theta)/(sin 2 theta + sin 14 theta) = -1 .

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

(cos theta + sin theta )/( cos theta - sin theta )-(cos theta - sin theta )/( cos theta + sin theta ) =

Prove that : (sin theta + 2 sin 3theta + sin 5theta)/(sin 3theta + 2 sin 5theta + sin 7theta) = (sin 3theta)/(sin 5theta)

If" " 0 < theta < pi/2, " then show that " sin theta sin 2 theta sin 3 theta le 9/16

(sin theta + cos theta)/(sin theta - cos theta) + (sin theta - cos theta)/(sin theta + cos theta)= ________

If : 0 lt theta lt pi/2 and sin 7theta + sin 4 theta + sin theta=0 , then : theta =