If `cos theta =7/25` and `theta` is an angle in the fourth quadrant,
find the value of `(25 cos theta -7 tan theta)/(cos theta-sin theta)`.

Prove that sin (3theta)/(1+2cos 2theta)=sin theta .

Prove that (sin2theta)/(1+cos2theta)=tantheta

Evaluate |[cos theta, -sin theta], [sin theta, cos theta]|

If cos theta=-1/2 and theta lies in III quadrant,then find other five trigonometric functions.

Prove that (sin2theta)/(1-cos2theta)=cottheta

The value of (1)/(8) (3 - 4 cos 2 theta + cos 4 theta) is

if cos theta_(1) + cos theta_(2) + cos theta_(3)= sin theta_(1) + sin theta_(2) + sin theta_(3)= 0 , then the value of cos (theta_(1) + theta_(2)) + cos (theta_(2) + theta_(3)) + cos (theta_(3) + theta_(1)) is

Solve sqrt 2+sin theta=cos theta .

Find (dy/dx) , if x=a cos theta, y=a sin theta

Find dy/dx , if x=sintheta-cos theta and y=sintheta+cos theta