Definition:Tangent Function/Real
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Definition
Let $x \in \R$ be a real number.
The real function $\tan x$ is defined as:
- $\tan x = \dfrac {\sin x} {\cos x}$
where:
The definition is valid for all $x \in \R$ such that $\cos x \ne 0$.
Sources
- 1977: K.G. Binmore: Mathematical Analysis: A Straightforward Approach ... (previous) ... (next): $\S 16.5 \ (2)$