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

Let `f(theta)=sintheta(sintheta+sin3theta)dot` Then `f(theta)i s` `geq0on l yw h e nthetageq0` (b) `lt=0fora l lr e a ltheta` `geq0fora l lr e a ltheta` (d) `lt=0on l yw h e nthetalt=0`

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`

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The correct Answer is:
C
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