數學上,恆等式(英語:Identity),方程式的一種,特性是恆等號或等號兩邊的表達式無論其變量如何取值,兩邊的結果永遠相等[1]

例子

乘法公式類恆等式

函數類恆等式

以人命名的恆等式

外部連結

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