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ACT Math Pre-Algebra: Drill 3, Problem 4. Find the solution to this equation.
ACT Math 2.4 Trigonometry 257 Views
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Description:
ACT Math: Trigonometry Drill 2, Problem 4. Which formula does the graph in the video represent?
- Trigonometry / Trig graphs
- Product Type / ACT Math
- Foreign Language / Arabic Subtitled
- Foreign Language / Korean Subtitled
- Foreign Language / Spanish Subtitled
- Foreign Language / Chinese Subtitled
- Functions / Model periodic phenomena with trigonometric functions
- Functions / Model periodic phenomena with trigonometric functions
- Trigonometry / Graphing trigonometric functions
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.
Full Transcript
- 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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