Write the equation of the sinusoidal function shown. A) y = 2 cos x

B) y = 2 cos x – 1

C) y = 2 sin x + 1

D) y = 2 sin x – 1

B.  y = 2 cos x - 1

Step-by-step explanation:

This is a cosine function as it is symmetrical about the y axis.

It is cos x stretched vertically by a factor 2 and moved 1 unit down

step-by-step explanation:

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