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If tan^(-1)(x^(2)+y^(2))=alpha then (dy)...

If `tan^(-1)(x^(2)+y^(2))=alpha` then `(dy)/(dx)` is equal to

A

`(-x)/(y)`

B

`xy`

C

`(x)/(y)`

D

`-xy`

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The correct Answer is:
A
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