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Right Triangles and Trigonometry Videos 37 videos
Mosquitos need their caffeine, just like the rest of us. Wouldn't think zipping around and stinging people all day long sap your energy?
ACT Math Trigonometry Drill 1, Problem 2. Can you find the tangent?
ACT Math: Trigonometry Drill 1, Problem 3. Can you find the cosine?
ACT Math 2.5 Trigonometry 416 Views
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Description:
ACT Math: Trigonometry Drill 2, Problem 5. Which equation is expressed by the graph in this video?
Transcript
- 00:02
Here's your shmoop du jour...
- 00:04
Which equation is expressed in the following graph?
- 00:07
And here are your options...
- 00:11
Don't worry, you're not seeing things. The cosine graph really is lined up incorrectly
- 00:17
with the x-axis values. But... what does this mean?
Full Transcript
- 00:22
Well the graph was shifted a bit to the right
- 00:24
or left. ...which means that there is an addition or
- 00:26
subtraction to the x in the parentheses of the cosine function, which is expressed in
- 00:31
options A and D. Now we just have to figure out if it is plus 2 or minus 2.
- 00:38
A plus two would mean a shift to the left, while a minus two would mean a shift to the
- 00:41
right. If we were to draw a normal cosine graph on the same set of axis, it would be
- 00:46
a bit to the right of the one shown. That means that the graph here was shifted
- 00:50
to the left, yielding a result of cos(x + 2).
- 00:54
This is represented in choice A. Which turns out to be our answer!
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