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If int 1/(1+sinx)dx=tan(x/2+a)+b, then ...

If `int 1/(1+sinx)dx=tan(x/2+a)+b`, then 1) `a=-pi/4, b in R` 2) `a = pi/4, b in R` 3) `a =(5pi)/4, b in R` 4)none of these

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