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# Determine the amplitude, period, and phase shift?

Determine the amplitude, period, and phase shift of

y= -2cos(πx-3)

With an explanation cause I'm totally lost! :)

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- 8 years agoFavorite Answer
y=Acos(B(m-C)+d

A= Amplitude

C = Phase shift

and some extra info for you

period = (2pi)/b

principal axis : y=d

you need to factor out (pix-3) to get in the B(m-c) format

factor out pi

Pi(x-(3/pi))

also its the same for sin.

Amplitude = -2

Phase shift = 3/pi

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