`2int(1+cos4x)/(1-cos4x)dx=`

A

(a) `-cot2x-2x+c`

B

(b) `cot2x-2x+c`

C

(c) `-cot2x+2x+c`

D

(d) `cot2x+2x+c`

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The correct Answer is:

A

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