Trigonometry
Write an equation that represents the graph shown. The equation should be in simplest form (b>0b>0b>0 and phase shift is not included).
y=32cosxy=\frac32\cos xy=23cosx
y=12cos(2x)y=\frac12\cos\left(2x\right)y=21cos(2x)
y=3cos(4x)y=3\cos\left(4x\right)y=3cos(4x)
y=32cos(4x)y=\frac32\cos\left(4x\right)y=23cos(4x)