The Graph of Cosine Function shows a repeated pattern for every π/2 radians. For the function f(x)=cos(x) the graph has a domain of -∞ < x < ∞and a range of -1 ≤ y ≤ 1 and it crosses the origin. Also for every nπ/2 radians (where "n" is an interger) the cosine function passes through y=0.
This is an example of how a Graph of a Cosine Function looks like:
The equation for the cosine function looks like this: cos(a) = adjacent/hypotenuse= b/h The sinusoid of the sine function looks like this: y=a cos(bx+c)+d and each variable represents a certain part of the graph: a= amplitude b/2π= period c= phase shift d= vertical shift
If you need a little more help or information take a look at the video below from Khan Academy!