Question

2 cos square tihta - 3cos tihta =0

Answer 1

Answer:

theta is equal to pi/2 and cos^-1(3/2)

Step-by-step explanation:

take cos theta =x and then solve quadratic

2x^2 + 3x =0

Answer 2

Answer

To prove:

2 cos^2 Ø - 3 cos Ø = 0

Proof:

Take cos Ø common:

cos Ø ( 2 cos Ø - 3 ) = 0

=> cos Ø = 0, $\tt{\frac{3}{2}}$