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If y = (e^(x)+e^(-x))/(e^(x)-e^(-x))then...

If y = `(e^(x)+e^(-x))/(e^(x)-e^(-x))`then is equal to...

A

`sec h^(2) x`

B

`cosec h^(2) x`

C

`- sec h^(2)x`

D

`- cosec h^(2) x`

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The correct Answer is:
D
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