Answer:
c. The amplitude is 1.
The period is [tex]\frac{2\pi}{3}[/tex]
Step-by-step explanation:
The given cosine function is ;
[tex]f(t)=-\cos 3t[/tex]
This function is of the form;
[tex]f(t)=a\cos bt[/tex]
The amplitude is given by |a|
|-1|=1
The period of this function is given by;
[tex]T=\frac{2\pi}{|b|}[/tex]
[tex]T=\frac{2\pi}{|3|}=\frac{2\pi}{3}[/tex]
The amplitude is 1.
The period is [tex]\frac{2\pi}{3}[/tex]
