Question

Which of the following functions is not a sinusoid?
a. y= cos x
b. y= sin x
c. y=x^2
d. none

Answer 1

Sinusoid is a sine or a cosine curve.

THIS IS A SINE WAVE



THIS IS A COSINE WAVE



Both are very similar [sinusoidal] but are just displaced by 90 degrees on the x-axis.

But the y = x^2 is not a sinusoid curve.



Understood? :)