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If y=tan ^(-1) ((x-a)/( x+a)),then (dy)...

If ` y=tan ^(-1) ((x-a)/( x+a)),then (dy)/(dx)=`

A

` (-a^(2))/( a^(2)+ x^(2))`

B

` (a^(2))/( a^(2)+ x^(2))`

C

` (-a)/( a^(2)+ x^(2))`

D

` (a)/( a^(2)+ x^(2))`

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The correct Answer is:
D
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