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Let f(x) =cos x sin 2x, then :...

Let `f(x) =cos x sin 2x`, then :

A

min. `f(x)gt -(2)/(9)` for `x in (-pi, pi)`

B

min. `f(x) gt -(1)/(9)` for `x in [-pi, pi]`

C

min. `f(x)= -(1)/(3sqrt(3))` for `x in [-pi, pi]`

D

min. `f(x) gt (-9)/(7) or (-7)/(9)` for `x in [-pi, pi]`.

Text Solution

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The correct Answer is:
D
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