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Let f(theta)=sintheta(sintheta+sin3theta...

Let `f(theta)=sintheta(sintheta+sin3theta).Then, f(theta)`

A

`ge0` only when `thetage0`

B

`le0` for all `theta`

C

`ge0` for all real `theta`

D

`le0 only when `thetale0`

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