ComplexExpand
 Usage
Notes
 Further Examples
You can expand complex powers.
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The result here is not x  y because x or y could be complex.
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This assumes x and y are real.
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You can expand complex exponential, trigonometric, and hyperbolic functions.
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You can expand trig and hyperbolic functions of complex arguments.
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Using the TargetFunction option This forces Mathematica to assume both x and y are real.
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This is an expansion in terms of z and the absolute value of z.
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Now we expand in terms of polar coordinates.
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Finally, here is an expansion in terms of z and its conjugate.
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