We are given that,

We need to find the value of x.

We know that by trigonometric identity, we can represent sin θ, cos θ and tan θ in terms of tan θ.

Note,

So, in the equation given in the question, let x = tan θ.

Re-writing the equation,

Substituting the values of trigonometric identities,

Using the property of inverse trigonometry, we have

sin^-1 (sin A) = A, cos^-1 (cos A) = A and tan^-1 (tan A) = A

Now, in order to find the value of x, recall

x = tan θ

Substitute the value of θ derived above,