Answer: Option D
phase
Step-by-step explanation:
By definition, the cosine function has the following form
[tex]y = cos (x - \phi)[/tex]
Where [tex]\phi[/tex] is known as the phase angle
By definition the sinx function is equal to the cosx function with a phase shift of [tex]\frac{\pi}{2}[/tex]
So if we have the function
[tex]y = cos (x - \phi)[/tex] and we want to transform it into the function [tex]y=sin(x)[/tex] then [tex]\phi = \frac{\pi}{2}[/tex]
Finally
[tex]y = cos(x - \frac{\pi}{2})=sin(x)[/tex]
the answer is the option D
