cos — Math

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cos( z )

The cosine of z in Math. Defined by

$\cos z = \frac{ e^{iz} + e^{-iz} }{ 2 }$

Real part on the real axis:

Imaginary part on the real axis is zero.

Real part on the imaginary axis:

Imaginary part on the imaginary axis is zero.

Real part on the complex plane:

Imaginary part on the complex plane:

Absolute value on the complex plane:

Related functions: sin sec arccos

Function category: circular functions