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int(dx)/(cosx+sinx) is equal to...

`int(dx)/(cosx+sinx)` is equal to

A

`(1)/(sqrt(2))log tan((x)/(2)+(pi)/(8))+C`

B

`(1)/(sqrt(2))log[cosec((x)/(2)+(pi)/(8))+cot((x)/(2)+(pi)/(8))]+C`

C

`-(1)/(sqrt(2))log[cosec((x)/(2)+(pi)/(8))-cot((x)/(2)+(pi)/(8))]+C`

D

`-(1)/(sqrt(2))log[cosec((x)/(2)-(pi)/(8))+cot((x)/(2)-(pi)/(8))]+C`

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