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OpenStudy (anonymous):
Which of the following graphs best represents f(x) = −2 cos 4x − 1?
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OpenStudy (anonymous):
OpenStudy (geekfromthefutur):
We know its not the 3rd one and we know its not the last one.
OpenStudy (anonymous):
how do you know that? sorry, this lesson was really confusing for me
OpenStudy (geekfromthefutur):
Because the 3rd and 4th one. Notice the green line in the graph what do you see
OpenStudy (geekfromthefutur):
Whats the difference between them both
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OpenStudy (anonymous):
-2 is the amplitude i think, right? so the green line should be on that?
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