Choose the correct answer

We need to find the value of

Let 2 cot-1 3 = y


Substituting 2 cot-1 3 = y,

Using the trigonometric identity,


We know that,


We know that, by trigonometric identity,

Take reciprocal of both sides,

Put y = y/2.

Putting the value of cot y in equation (i),

Put the value of derived above and also .