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If f(x)=log(cosx), then which of the fol...

If `f(x)=log(cosx)`, then which of the following is f''(x) ?

A

`sec^(2)x`

B

`-sec^(2)x`

C

`"cosec"^(2)x`

D

`-"cosec"^(2)x`

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