1 Answer

Logarr · Answer 1 · 2023-03-21T14:29:28+0000

So,

To answer this question, we could use the fact that:

$\cos (x-(\pi)/(2))=\sin x$

Now, given:

$y=9\sin ((4\pi)/(3)x)$

We could affirm that this expression is equivalent to:

$y=9\cos ((4\pi)/(3)x-(\pi)/(2))$

A similar situation occurs to this function:

$y=3\sin ((\pi)/(3)x)$

An equivalent cosine function could be:

$y=3\cos ((\pi)/(3)x-(\pi)/(2))$

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