The Imaginary part reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Imaginary part

An imaginary part is the second element of the ordered pair of real numbers representing a complex number, i.e. if z=x+iy then the imaginary part of z is y.

The imaginary part of the complex number is returned by a complex function.

If a complex mumber is written as r e^iθ, then the imaginary part is r sin(θ).

See also: Imaginary number

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