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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

` le 0` for all `theta`

C

`ge 0` for all real `theta`

D

`le 0` only when `theta le 0`

Text Solution

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The correct Answer is:
C
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