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firmware-and-api-reference/micropython/cmath.md

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+# 5.3.6 cmath
+
+The `cmath` module provides some basic mathematical functions for working with complex numbers. Floating point support required for this module.
+
+## Functions
+
+### cmath.cos\(z\)
+
+Return the cosine of `z`.
+
+### cmath.exp\(z\)
+
+Return the exponential of `z`.
+
+### cmath.log\(z\)
+
+Return the natural logarithm of `z`. The branch cut is along the negative real axis.
+
+### cmath.log10\(z\)
+
+Return the base-10 logarithm of `z`. The branch cut is along the negative real axis.
+
+### cmath.phase\(z\)
+
+Returns the phase of the number `z`, in the range \(-pi, +pi\).
+
+### cmath.polar\(z\)
+
+Returns, as a tuple, the polar form of `z`.
+
+### cmath.rect\(r, phi\)
+
+Returns the complex number with modulus `r` and phase `phi`.
+
+### cmath.sin\(z\)
+
+Return the sine of `z`.
+
+### cmath.sqrt\(z\)
+
+Return the square-root of `z`.
+
+## Constants
+
+* `cmath.e`: Base of the natural logarithm
+* `cmath.pi`: The ratio of a circle’s circumference to its diameter
+