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Re

Returns the real part of a number. For real numbers, returns the number itself.

$ wo 'Re[5]'
5

$ wo 'Re[3.14]'
3.14

$ wo 'Re[3 + 4*I]'
3

A complex exponential resolves to its trigonometric form:

$ wo 'Re[2 E^(Pi I/25)]'
2*Cos[Pi/25]