## Algebra 2 (1st Edition)

The amplitude and period of a graph $y=a\cos (bx)$ or $y=a\sin(bx)$ can be obtained by (if $a,b$ are non-zero): amplitude: $|a|$, period: $\frac{2\pi}{|b|}$. Hence here the amplitude is: $|1|=1$ Period: $\frac{2\pi}{|\pi|}=2$.