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## Homework Statement

Show that a wave function is phase-shifted by (pi)/2 when multiplied by

i and by (pi) when multiplied by −1.

## Homework Equations

The wave function form I am using is function = A(cos(kx-wt)+isin(kx-wt))

But it was not specified which kind I can use

## The Attempt at a Solution

I am not sure even where to begin...

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