Question

if cos 3 theta = sin 2 theta find theta​

Answer 1

Step-by-step explanation:

$\cos3 \alpha = \sin2 \alpha$

$\sin(90 - 3 \alpha ) = \sin(2 \alpha )$

$90 - 3 \alpha = 2 \alpha$

$5 \alpha = 90$

$\alpha = 18$

So,theta is 18°