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If Cos ^(-1) (( x ^(2) - y ^(2))/(x ^(2)...

If `Cos ^(-1) (( x ^(2) - y ^(2))/(x ^(2) + y ^(2)))=k` (a constnat), then `(dy)/(dx) =`

A

`(y)/(x)`

B

`(x)/(y)`

C

`-2`

D

`-3`

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The correct Answer is:
A
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