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ACT Math: Trigonometry Drill 4, Problem 3. What is the length of side b?
ACT Math 4.5 Trigonometry 256 Views
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ACT Math: Trigonometry Drill 4, Problem 5. What is the equation of the graph?
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.
Full Transcript
- 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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