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- Thread starter TonyC
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- #2

VietDao29

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[tex]-1 \leq \cos \alpha \leq 1[/tex]

So what can you say about the [tex]y = 21 - 5 \cos \frac{\pi t}{6}[/tex]

Viet Dao,

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What are you looking for?

- #4

VietDao29

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[tex] 5 \cos \frac{\pi t}{6}[/tex] is maximum.

So [tex] \cos \frac{\pi t}{6}[/tex] is maximum.

So y is minimum means that [tex] \cos \frac{\pi t}{6}[/tex] is maximum.

[tex]-1 \leq \cos \frac{\pi t}{6} \leq 1[/tex] so what t makes [tex] \cos \frac{\pi t}{6}[/tex] maximum?

Viet Dao,

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