2cosx=3^1/2
2cosx = √3
cosx = √3/2
x = π/6
that is one of the standard angles, whose trig functions you would do well to memorize.
Now, recall that cosx is positive in both QI and QIV
cosx = √3/2
x = π/6
that is one of the standard angles, whose trig functions you would do well to memorize.
Now, recall that cosx is positive in both QI and QIV