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The function f(x)=4sin^(3)x-6sin^(2)x+12...

The function `f(x)=4sin^(3)x-6sin^(2)x+12sinx+100` is strictly

A

increasing in `(pi,3pi/2)`

B

decreasing in `(pi/2,pi)`

C

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

D

decreasing in `(0, pi/2)`

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