Which of the following illustrates a phase shift?

A. y = -2 - cos(x-π)

Explanation:

The general form of the trig equation is:

y = A sin (Bx + C) + D

where:

A is the amplitude

is the period

is the phase shift

D is the vertical shift

Now, let's check the choices:

A. y = -2 - cos(x-π)

Therefore, the function has a phase shift of π

B. y = 3 cos(4x)

Therefore, the function has no phase shift

C. y = tan(2x)

Therefore, the function has no phase shift

D. y = 1 + sin(x)

Therefore, the function has no phase shift

Based on the above, the correct answer is A

Hope this helps :)

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step-by-step explanation:

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