Question

Which of the following functions is not a sinusoid?

y = sin x


y= Sqrtx


y = cos x


None of the above are sinusoids.

Answer 1

A sinusoid is cyclical and has a period or frequency.

y = sin x is a sinusoid, with a period of 2π.
y = √x is not a sinusoid.
y = cos x is a sinusoid with a period of 2π.

Answer: y = √x is not a sinusoid.