Question

Which function's graph is shown below?

A. y = cos x
B. y = -sin x
C. у= sin x
D. у= -cos x

Answer 1

y=cos x

Explanation:

Answer 2

A. y = cos x

Explanation:

The function that we see graphed has the point (0,1), this means whichever trig function f(x) it represents f(0) = 1.

Now, only the cosine function has the property that cos(0) = 1, thus choice A is the correct answer.