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If y = cos^(-1)""(9-x^2)/(9+x^2) then y^...

If `y = cos^(-1)""(9-x^2)/(9+x^2)` then `y^(1)(-1)` is equal to

A

`-3//5`

B

`3//5`

C

`2//7`

D

`3//8`

Text Solution

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The correct Answer is:
B
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