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ACT Math 4.5 Trigonometry 253 Views


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ACT Math: Trigonometry Drill 4, Problem 5. What is the equation of the graph?

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Transcript

00:02

For a good time, solve this shmoopy question.

00:05

Which is the equation of the graph below?

00:07

And here are the choices:

00:11

What we have here looks like a sin curve, since its initial portion moves through the

00:16

origin (0, 0). That leaves us with the first three answer choices.

00:20

Next, for the amplitude, the graph moves three up and three down, so it's... 3. Simple

00:27

as that. We're down to answers B and C now. Finally, we have to take into account the

00:32

period of the graph.

00:34

The sin wave completes its first full cycle at π, which is twice

00:39

as fast as a normal sin wave. That means that the coefficient in the parentheses

00:43

should be 2. We have our match -- answer B.

00:47

Now wave bye-bye to the wave...

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