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?
Y = 1/3 cos2 theta
Y= 2cos3 theta
Y= 3cos theta/2
Y= 3cos2 theta
Please explain how you get the answer as well as what the answer is. I’m having a hard time understanding this. Thanks for any help! 🙂
at theta =0, cos ntheta = 1
only answer 3 and 4 agree with this
at theta = pi/4 (45deg) cos = .707, cos 2theta = 0, cos theta/2 =.924
only eq 4 agrees with this.