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phase shift

The horizontal shift of a sinusoid, the C in A sin(B(x−C))+D.

The phase shift $C$ is the horizontal shift of a sinusoid $y=A\sin(B(x-C))+D$ — the graph shifts right by $C$ when $C>0$ and left by $|C|$ when $C<0$ , a minus sign inside the parentheses moving the graph in the positive direction.