1.

If int(1+cos alpha cos x)/(cos alpha+cos x)dx=ax+b log[(cot(alpha//2)+tan(x//2))/(cot (alpha//2)-tan(x//2))]+c then (a,b)-=

Answer»

`(SIN alpha, - COSALPHA)`
`(COS alpha, sin alpha)`
`(sec alpha, cos alpha)`
`(cos alpha, cos alpha)`

Answer :B


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