What is the equation of the graph below?

A

Step-by-step explanation:

look at the graph and u will find the same answer

 The correct option is (A)

Step-by-step explanation:  We are to select the correct equation of the given graph.

From the graph, we can see that

y (x = 0) = 1,

y (x = 90°) = 0,

y (x = -90°) = 0,

y (x = 180°) = -1,

y (x = -180°) = -1, etc.

Option (A) is

We have

So, this option is correct.

Option (B) is

We have

So, this option is not correct.

Option (C) is

We have

So, this option is not correct.

Option (D) is

We have

So, this option is also not correct.

Thus, the correct option is (A)