Question

if 2 cos3 theta =1 find the value of theta​

Answer 1

Step-by-step explanation:

$let \: theata \: = x \\ 2 \cos(3x) = 1 \\ \cos(3x) = \frac{1}{2} \\ \cos(3x) = \cos(60) \\ 3x = 60 \\ x = 20$

theta = 20°