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Im

Returns the imaginary part of a number. For real numbers, returns 0.

$ wo 'Im[5]'
0

$ wo 'Im[3.14]'
0

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

An exact symbolic coefficient of I is kept exact, not collapsed to a float.

$ wo 'Im[I Pi]'
Pi

$ wo 'Im[5 Pi I/3]'
(5*Pi)/3