Question

Find value of x if 2cos3x=1

Answer 1

2cos3x=1
cos 3x =1/2
cos 3x =cos 60 (because cos 60=1/2)
3x=60
x=20
therefore the value of x is 20.

Answer 2

2 cos 3x = 1
cos 3x = 1/2
cos 3x = cos 60
3x = 60
x = 20
Therefore, the value of x is 20