# How do you find the amplitude and period of y=3/4cos(1/2theta)?

Amplitude = 3/4 & Period = $4 \pi$
Standard form $y = a \cdot \cos \left(b \left(\theta\right) + c\right) + d$
Where a is Amplitude and $\frac{2 \pi}{b}$ is period
$a = \left(\frac{3}{4}\right)$ & period $= \frac{2 \pi}{\frac{1}{2}} = 4 \pi$