If `0lt theta_2 lt theta_1 lt pi/4, cos(theta_1+theta_2)=3/5` and `cos(theta_1-theta_2)=4/5` then `sin2theta_1=`

If 0 lt theta_(2) lt theta_(1) lt pi/4, cos (theta_(1) + theta_(2)) = 3/5 and cos(theta_(1)-theta_(2))=4/5 , then sintheta_(1) sintheta_(2) equal to

If 0 lt theta_(2) lt theta_(1) lt pi/4, cos (theta_(1) + theta_(2)) = 3/5 and cos(theta_(1)-theta_(2))=4/5 , then sintheta_(1) sintheta_(2) equal to

If 0

If theta _(1), theta _(2), theta _(3) and theta_(4) be the ecentric angles of point where a circle cuts an ellipes such that pi lt theta _(1) + theta _(2) + theta_(3)+ theta_(4) lt 5pi, then cos (theta _(1) + theta _(2)+theta _(3) +theta_(4)) equals to "______"

If 0 lt theta lt pi/4 then show that sqrt(2+sqrt(2(1+cos 4theta)))=2 cos theta

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

If pi/2 lt theta lt 3 pi/2 then sqrt( (1-sin theta)/(1+ sin theta )) - tan theta is

If 3 sin theta+4cos theta=5(0lt theta lt pi/2) , show that sin theta =3/5 .