If 2 cos²x + 3  sin x -3 = 0, 0≤ x,≤180⁰, then x =

The solutions set of the equation(2 cosx -1) (3+2 cosx ) =0 in the interval o ≤ r ≤ 2 Π is

If sin 5 x + sin 3 x + sin x =0, beside 0, in 0 ≤ x ≤ π/2 the value of x is

tan 211^o =_______

If A and B are acute angles such that sin A  = sin²  B and 2 cos² A  = 3  cos² B, then the value of A is.

The value of sin 47^o  + cos 61^o -sin  11^o  - sin 25^o  is.

If θ = 30^o find the value of sin²θ + cos²θ

1 - cos²θ - sin²θ = ___________

The value of cos (270^o + θ) - sin (270^o - θ) cos θ is.