Question

Which function is shown on the graph?

A: f(x) = -1/2sin x
B: f(x)= 1/2sin x
C:f(x)= 1/2cos x
D: f(x)= -1/2cos x​

Answer 1

C: f(x)=1/2cos(x)

Explanation:

We can see that the amplitude is 1/2 since the function oscillates between -1/2 and 1/2. This eliminates choices A and D. Also, since the function starts at its maximum, this is a cosine function, making the correct answer C.