Question

What is the equation of the graph below?

On a coordinate plane, a curve crosses the y-axis at y = 1 and then completes one cycle at 360 degrees.
y = sine (x + 90 degrees)
y = cosine (x + 90 degrees)
y = sine (x + 45 degrees)
y = cosine (x + 45 degrees

HELP!!!

Answer 1

A. y = sine (x + 90 degrees)

Explanation:

• y = cosine(x) is a curve that crosses the y-axis at y = 1 and completes one cycle at 360 degrees.

• sine(x) have the same curve than cosine(x), but translated 90° to the right respect cosine(x)

• f(x + c) translates f(x) horizontally c units to the left.

• Then, sine(x + 90) is equivalent to cosine(x)