If `R(theta) = [(cos theta, sin theta),(sin theta, -cos theta)]` Write:- `R(pi/2)`.

If R(theta) = [(cos theta, sin theta),(sin theta, -cos theta)] Write:- R(x +y).

If A = [[cos theta, sin theta],[-sin theta, cos theta]] , then what is A^(-1) ?

Solve 2cos^2 theta+3 sin theta=0

If sin theta-cos theta=0 ,find the value of sec theta+ cosec theta

Solve sin 2theta+sin 4 theta+sin 6 theta=0 .

Prove that (1+cos theta)/(sin theta)=(1+sin theta+cos theta)/(1+sin theta-cos theta) .

Evaluate (sin (90 - theta). cos (90 - theta))/(sin theta cos theta)

Prove that sqrt((1-sin theta)/(1+sin theta))+sqrt((1+sin theta)/(1-sin theta))=-2/cos theta ,where pi/2ltthetaltpi .

Express sin theta , cos theta , tan theta in terms of cosec theta .

If tan theta = p/q , proved that (p sin theta -q cos theta)/(p sin theta+q cos theta) is (p^2-q^2)/(p^2+q^2) .