Complex Root Problem (easy)

Homework Statement

Use Euler's formula to write $2^{1-i}$ in the form a+ib.

The Attempt at a Solution

I know this has to be so simple because I could do this easy if the question was to write $e^{1-i}$ in the form a+ib using Euler's. So what I do not understand is how does 1-i being raised on 2 rather than e change what I need to do to solve it. Thank you.