Question

Anybody have the answer to this?

Answer 1

Fill in the given values in

... y = (amplitude)×cos(2π(x + (horizontal offset to the left))/(period)) + (vertical shift)

... y = 4×cos(2(x+pi/2)) +3

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Note that the period is π and the horizontal offset is π/2, half a period. This has the effect of turning the waveform upside down.