The function is in the form of $y=A-B\cos(C(x+D))$, where $A$ is the vertical shift, $B$ is the amplitude, $C$ is the frequency, and $D$ is the phase shift.
In this case, $A=4$, $B=3$, $C=\pi$, and $D=-1$. This means the graph has a vertical shift of 4 units up,
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