`f(x) = 2cos(2x), g(x) = -cos(4x)` Sketch the graphs of f and g in the same coordinate plane. (Include 2 full periods)

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caledon eNotes educator| Certified Educator

2cos(2x): amplitude 2, period pi

-cos(4x): amplitude 1, period pi/2

2cos(2x) red, -cos(4x) yellow