Definition:Cotangent/Real Function
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Definition
Let $x \in \R$ be a real number.
The real function $\cot x$ is defined as:
- $\cot x = \dfrac {\cos x} {\sin x} = \dfrac 1 {\tan x}$
where:
The definition is valid for all $x \in \R$ such that $\sin x \ne 0$.