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int 1/(sqrt(1+ cos x)) dx =...

`int 1/(sqrt(1+ cos x)) dx` =

A

(A) `sqrt2 log|secfrac(x)(2)+tanfrac(x)(2)|+c`

B

(B) `1/sqrt2 log|secfrac(x)(2)+tanfrac(x)(2)|+c`

C

(C) `log|secfrac(x)(2)+tanfrac(x)(2)|+c`

D

(D) `2 log|secfrac(x)(2)+tanfrac(x)(2)|+c`

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