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OpenStudy (anonymous):
Domain and range of f(x)=-4cos2x?
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OpenStudy (anonymous):
domain is all reals range is [-4,4]
OpenStudy (anonymous):
Thank you so much.
OpenStudy (anonymous):
yw
OpenStudy (anonymous):
range of cos is [-1, 1], you are vertically stretching the graph by multiplying it by |-4|, (also reflecting it across the x-axis, but not relevant to this question)
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