Question

Which of the following functions is not a sinusoid?
A. y = |x|
B. y = sin x
C. y = cos x
D. None of the above are sinusoids.

Answer 1

A sinusoid is a curve that shows a smooth oscillation, and it repeats after a certain period.
If you graph the trig functions of sin(x) and cos(x), you'll see that they produce sinusoidal graphs. The range of these functions is only from -1 to 1, and it'll repeat.

y = |x| is not a sinusoidal graph. It's basically a v-shaped graph, with no oscillations or repetition.

Answer 2

Thank you!