Question

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

Answer 1

B. y = 2 cos x - 1

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