## Algebra and Trigonometry 10th Edition

$Period=0.9375~s$ coefficient of $t$: $2.133$
$t=\frac{1}{64}~minute=\frac{1}{64}\times60~second=0.9375~second$ The period of $cos~x$ is $2\pi$: $Bt=2\pi$ $B=\frac{2\pi}{0.9375}=2.133$