Functions — act-dog

Mathematics Preparing for Higher Math · Functions Q15

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Question 15 as printed in the ACT Practice Test 2 booklet — As printed in the official booklet.

What is the amplitude of the graph of function _ 1 f (x) = cos (3x + π) , shown in the standard (x,y) coordinate plane? y O x −1 _ 1

A
_ 1
B
C
2
D
3

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