ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Right Triangles and Trigonometry Videos 37 videos
Verifying trig identities is important, especially when you're about to let one of them into the country—which is why they should keep their pass...
Mosquitos need their caffeine, just like the rest of us. Wouldn't think zipping around and stinging people all day long sap your energy?
Sine is the opposite over the hypotenuse; cosine is the adjacent over the hypotenuse; and tangent is the opposite side over the adjacent side....
ACT Math 2.5 Trigonometry 416 Views
Share It!
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!
Related Videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
ACT Math: Plane Geometry Drill 3, Problem 1. What is the area of the trapezoid shape in the video?
Haven't you always wondered how much cardboard it takes to encase a trunk warmer for your pet elephant?
Want to figure out the area and perimeter of irregular shapes? Break them down into regular shapes. For example, a flower can be broken down into s...