Question

The graph shown is the graph of f(x) = cos(x). True or False

Answer 1

This is true. the trigo functions sine and cosine are sinusoidal in behavior, which means they form wave-like patterns. To determine if it's a sine or cosine function, you look at point at its y-intercept. If it starts from the bottom, then that is a sine wave, In this case, it starts from the top, so it is a cosine function.