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Let f(theta)=sin theta(sintheta+sin3thet...

Let `f(theta)=sin theta(sintheta+sin3theta),` then `f(theta)` (A) `ge0` only when `thetage0` (B) `ge 0` for all real `theta` (C) `ge 0` for all real `theta` (D) `le 0` only when `theta le 0`

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