Inverse Trigonometric FunctionHard

Question

The sum of the infinite terms of the series -
cot-1+ cot-1 + cot-1 + ......... is equal to -

Options

A.tan-1 (1)
B.tan-1 (2)
C.tan-1 (3)
D.- tan-1 3

Solution

= cot-1
=
=
Now it can be solved.

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