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If int ( 2dx)/(sqrt(cot^2x - tan^2 x) )...

If ` int ( 2dx)/(sqrt(cot^2x - tan^2 x) ) = - sqrt(f(x) ) + c` , then f(x) =

A

cot x

B

sin 2x

C

cos 2x

D

tan x

Text Solution

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The correct Answer is:
C
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