what is an identity in maths
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In mathematics, an identity is an equality relating one mathematical expression A to another mathematical expression B, such that A and B (which might contain some variables) produce the same value for all values of the variables within a certain range of validity.
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An identity is an equation which is always true, no matter what values are substituted. 2 x + 3 x = 5 x. is an identity because 2 x + 3 x will always equal regardless of the value of . Identities can be written with the sign ≡, so the example could be written as 2 x + 3 x ≡ 5 x .
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