int " x sec"^(2) " x dx "...

`int " x sec"^(2) " x dx "`

A

`tan x + log cos x +c `

B

`(x^2 )/(2) sec^2 x +log cos x+c `

C

` x tan x + log sec x +c `

D

`x tan x + log cos x+c `

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The correct Answer is:

D

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