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If x^(2)=1+cosy," then: "(dy)/(dx)=...

If `x^(2)=1+cosy," then: "(dy)/(dx)=`

A

`(2)/(sqrt(2-x^(2)))`

B

`(-2)/(sqrt(2-x^(2)))`

C

`(2)/(sqrt(x^(2)-2))`

D

`(-2)/(sqrt(x^(2)-2))`

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