Q. 18

# Mark (√) against the correct answer in each of the following:A. tan-1 (tan2 x) + CB. x2 + CC. - tan-1 (tan2 x) +CD. none of these

Let sec2 x-1=t

2 sec x sec x tan x dx=dt

We know,

=tan-1 t +c

put t=sec2 x-1

= tan-1 sec2x – 1 + c

= tan-1 tan2x + c

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