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int(cosalpha)/(a^2+sin^2alpha)d alpha is...

`int(cosalpha)/(a^2+sin^2alpha)d alpha` is equal to

A

`(1)/(a)tan^(-1)((a)/(sin alpha))+C`

B

`(1)/(a)tan^(-1)((sin alpha)/(a))+C`

C

`(1)/(a)tan^(-1)(a cos alpha)+C`

D

none of these

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The correct Answer is:
B
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