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Given: f(x)=4x^3 - 6x^2 cos 2 a + 3x sin...

Given: `f(x)=4x^3 - 6x^2 cos 2 a + 3x sin 2 a sin 6 a+ sqrt (In (2 a - a^2)` then

A

`af'((1)/(2))lt0`

B

`af'((1)/(2))le0`

C

`af'((1)/(2))gt0`

D

None of these

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