Complex Numbers A complex number is a number with a real and an imaginary part, usually expressed in cartesian form Complex numbers can also be expressed in polar form The polar form can also be expressed in terms of trigonometric functions using the Euler relationship	Index Complex numbers
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Euler Relationship

The trigonometric functions are related to a complex exponential by the Euler relationship

From these relationships the trig functions can be expressed in terms of the complex exponential:

This relationship is useful for expressing complex numbers in polar form, as well as many other applications. Applications:

Polar Form, Complex Numbers The standard form of a complex number is but this can be shown to be equivalent to the form which is called the polar form of a complex number. The equivalence can be shown by using the Euler relationship for complex exponentials.	Index Complex numbers
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Complex Numbers