Which transformation causes the described change in the graph of the function y = cos x? The transformation results in a horizontal shrink. The transformation results in a vertical stretch. The transformation results in a horizontal stretch. The transformation results in a vertical shrink.
(1) Answers
A: a horizontal shrink would be caused by cos 3x. B: a vertical stretch would be caused by 3 cos x C: a horizontal stretch would be caused by cos (1/3)x D: a vertical shrink would be caused by 1/3 cos x.
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