Question

if 2 cos 3 theta =1,the theta =60???​

Answer 1

Answer:

cos3 theta=1/2

cos 3theta=cos60°

3theta=60

theta=20

Answer 2

Answer:

2 cos 3Θ = 1

cos 3Θ = $\frac{1}{2}$

cos 3Θ = cos 60°  ( since, cos 60°  =  $\frac{1}{2}$)

3Θ  = 60 °

Θ  = 60°/3

Θ = 20 °