$\sin^2 x + \cos^2 x = 1$

Example · High school

Terms

Term	This example	Why
equation	✓
identity equation	✓	$\sin^2 x + \cos^2 x = 1$ is an identity because it is true for every $x$.
expression	✗	$\sin^2 x + \cos^2 x = 1$ is an equation because it says that two expressions are equal.

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