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If y=x^(2)+1" and "u=sqrt(1+x^(2))," the...

If `y=x^(2)+1" and "u=sqrt(1+x^(2))," then: "(dy)/(dx)=`

A

`(x)/(u)`

B

`(u)/(x)`

C

`2sqrt(1+x^(2))`

D

`(2)/(sqrt(1+x^(2)))`

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