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In triangle ABC, a,b remain constant but...

In triangle ABC, a,b remain constant but the base angles A and B very, then the value of `(dA)/(dB)` is -

A

`(sqrt(a^(2)-b^(2)cos^(2)A))/(b^(2)-a^(2)cos^(2)B)`

B

`(sqrt(a^(2)-b^(2)cos^(2)B))/(b^(2)-a^(2)cos^(2)A)`

C

`(sqrt(a^(2)-b^(2)sin^(2)A))/(b^(2)-a^(2)sin^(2)B)`

D

none of these

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The correct Answer is:
C
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