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

Let `f(theta) = sin theta (sin theta + sin 3 theta). "Then" f(theta)` is

A

`ge 0` only when `theta ge 0`

B

`le 0` for all real `theta`

C

`ge 0` for all real `theta`

D

`le 0` only when `theta le 0`

Text Solution

Verified by Experts

The correct Answer is:
C
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