# How do you write a sine equation with amplitude: 2, Period: 4?

$y =$Amplitude$\cdot \sin \left(\frac{2 \pi}{p e r i o d} x\right)$
$y = 2 \sin \left(\frac{2 \pi}{4} x\right) = 2 \sin \left(\frac{\pi}{2} x\right)$