Q 1366045875.     integrate : `int frac{1}{sin ^2 x cos ^2 x }dx`

A

`sec x+ tan x +c`

B

`tan x - sec x +c`

C

`tan x +cot x+c`

D

`tan x - cot x +c`

HINT

we written as `int frac{sin ^2 x +cos ^2 x}{sin ^2 x cos ^2 x }`
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