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int (1+xtanx)^(-2) dx = 1/(x+f(x))+c the...

`int (1+xtanx)^(-2) dx = 1/(x+f(x))+c` then f(x) =

A

x tan x

B

cot x

C

tan x

D

x cot x

Text Solution

Verified by Experts

The correct Answer is:
B
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