Question

For a particular angle theta, the cosine function has the following values within one cycle of the function.
cos 0 = 3, cos (pi/4)=0,cos (pi/2)=-3, cos (3pi/4)=0, cos pi =3

What is the rule for the cosine function?

Answer 1

if it helps i have multiple choice answers

y= 1/3 cos2 theta
y=2cos3 theta
y=3cos (theta/2)
y=3cos2 theta