Inverse Trigonometric FunctionHard

Question

If  x ∈ , then the value of  tan-1 + tan-1 is-

Options

A.x/2
B.2x
C.3x
D.x

Solution

tan-1 + tan-1
tan-1 + tan-1
tan-1
tan-1 = tan-1 tan x = x

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