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If y=e^(tan x), then cos^2 x(d^2y)/(dx^2...

If `y=e^(tan x)`, then `cos^2 x(d^2y)/(dx^2)` is equal to

A

`(1- sin 2x) dy/dx`

B

`-(1+sin 2x)dy/dx`

C

`(1+ sin 2x) dy/dx`

D

`(sin 2x-1) dy/dx`.

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