Evaluate: (i) `int2/(1+cos2x)\ dx` (ii) `int2/(1-cos2x)\ dx`

Explanation

(i)

` int frac{2}{1+cos 2 x} d x=int frac{2}{2 cos ^{2} x} d x `

`= int sec ^{2} x d x=tan x+c`



(ii)

`int frac{2}{1-cos 2 x} d x=int frac{2}{2 sin ^{2} x} d x `

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