If `2 sin^2 beta - cos^2 beta = 2` then `beta` is
a. `0^o`
b. `90^o`
c. `45^o`
d. `30^o`

If 2sin^(2)beta-cos^(2)beta = 2 ,then beta is (a ) 0° (b) 90° (c) 45°

If 2sin^(2)beta-cos^(2)beta = 2 ,then beta is (a ) 0° (b) 90° (c) 45°

If tan (alpha-beta)=(sin 2beta)/(3-cos 2beta) , then

The value of sin^2 alpha cos^2 beta + cos^2 alpha sin^2 beta + sin^2 alpha sin^2 beta +cos^2 alpha cos^2 beta is

(cos alpha + cos beta) ^ (2) + (sin alpha + sin beta) ^ (2) =

If cos alpha + cos beta = 0 = sin alpha + sin beta, then value of cos 2 alpha + cos 2 beta is