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ACT Math: Trigonometry Drill 1, Problem 1. What is the length of y?
ACT Math: Coordinate Geometry Drill 1, Problem 2. Solve the inequality and determine which solution is shown on the number line.
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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