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Let f(x)=3sin""^(4)x+10sin^(3)x+6sin^(2)...

Let `f(x)=3sin""^(4)x+10sin^(3)x+6sin^(2)x-3,x in[-(pi)/(6),(pi)/(2)]`.Then , f is :

A

increasing in `(-(pi)/(6),(pi)/(2))`

B

decreasing in `(0,(pi)/(2))`

C

increasing in `(-(pi)/(6),0)`

D

decreasing in `(-(pi)/(6),0)`

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