Solve `7cos^(2)theta+3sin^(2)theta=4`.

Find the least value of 2sin^(2)theta+3cos^(2)theta

The equation of a straight line which passes through the point (a cos^(3) theta, a sin^(3) theta) and perpendicular to x sec theta + y " cosec " theta = a is

The value of sec^(2)theta+cosec^(2)theta is equal to a) tan^(2)theta+cot^(2)theta b) sec^(2)thetacosec^(2)theta c) sec theta cosectheta d) sin^(2)theta cos^(2)theta

Solve costheta+cos3theta-2cos2theta=0 .

Prove that (cos2theta)/(1+sin2theta)=tan(pi//4-theta)