斜率

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Template:當代數學斜率者，線之正切也，亦線之高除以進，記曰 $m$ ，有

$m = \tan α = \frac{y_{2} - y_{1}}{x_{2} - x_{1}} = \frac{y_{1} - y_{2}}{x_{1} - x_{2}}$

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