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

Let `f(theta)=sintheta(sintheta+sin3theta)dot` Then `f(theta)` is (a)`geq0` only when `thetageq0` (b) `lt=0` for all real `theta` (c)`geq0` for all real `theta` (d) `lt=0` only when `thetalt=0`

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