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If y=e^(x)+e^(-x)," then: "(dy)/(dx)=...

If `y=e^(x)+e^(-x)," then: "(dy)/(dx)=`

A

`sqrt(y^(2)+4)`

B

`sqrt(y^(2)-4)`

C

`sqrt(4-y^(2))`

D

`4y^(2)`

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