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Let f(theta) =sin theta(sin theta + sin3...

Let `f(theta) =sin theta(sin theta + sin3theta)` then `f(theta)` :

A

`ge 0` only when `theta ge 0`

B

`leq 0` for all real `theta`

C

`ge 0` for all real values of `theta`

D

`leq 0` only when `thetale 0`

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