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ACT Math 2.4 Trigonometry 257 Views


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ACT Math: Trigonometry Drill 2, Problem 4. Which formula does the graph in the video represent?

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Transcript

00:02

Here's your shmoop du jour...

00:04

The graph represents which formula?

00:07

And here are your options...

00:11

Well, if we noticed the irregularities in the cos graph, we can get some clues about

00:16

the answer. This figure is... really curvy.

00:19

But, because it's so curvy... its period

00:22

is probably smaller than usual.

00:24

Because it is expressed by a coefficient greater than 1 in the parentheses; only answer choices

00:30

A, C, and D have that. As for its amplitude, it seems to reach 3

00:35

and negative 3, so there should be a 3 before the cos itself.

00:39

Of the three answer choices mentioned before, this is represented in choice A, which turns

00:44

out to be our answer. So it's A!

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