If y=(cosx)^(2x), then (dy)/(dx) is equa...

If `y=(cosx)^(2x)`, then `(dy)/(dx)` is equal to

A

`2(cosx)^(2x)(sinx-xtanx)`

B

`2(cosx)^(2x)[log(cosx)-xtanx]`

C

`2(sinx)^(2x)[log(cosx)-xtanx]`

D

`2(sinx)^(2x)xcotx`

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