Answer :

We are given with,

tan-1 3 + tan-1 x = tan-1 8

We need to find the value of x.

Using property of inverse trigonometry,

Let us replace A by 3 and B by x.

Since, according to the question

tan-1 3 + tan-1 x = tan-1 8


Taking tangent on both sides,

Using property of inverse trigonometry,

tan(tan-1 A) = A

Now, in order to find x, we need to solve the linear equation.

By cross-multiplying,

3 + x = 8(1 – 3x)

3 + x = 8 – 24x

24x + x = 8 – 3

25x = 5

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