1.

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

Answer»

` ge 0 ` ONLYWHEN ` THETA ge 0`
` ge 0 ` for all REAL `theta`
`gt0` for all real `theta`
`LE 0 ` only when `theta le 0`

Answer :C


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