Question

The equation cosx=(sqrt 3)/2 is an identity true or false

Answer 1

No. It is not an identity 'cause it involves trigonometric function and it's true for only single value (i.e.,30). You can also calculate the angle as follows:

Cos x = √3/2
x = cos⁻¹ √3/2
x = 30

In short, Your Answer would be "False"

Hope this helps!

Answer 2

false, because cos(x) has no definite answer, and equations aren't identities