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# State the amplitude, period and phase shift of y = 3 cos(x-pi)?

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- DavidK93Lv 71 decade agoFavorite Answer
In a sinusoidal function a*sin(bx - phi), where sin can be replaced by cos, the amplitude is a, the period is 2*pi/b, and the phase shift is phi. Inspection shows that your a is 3, b is 1, and phi is pi, so that should be enough for you to solve.

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