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What are identities in algebra?

Updated: 10/26/2022
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12y ago

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An equation in which the variable(s) can take any value and it is still true.

ex.

cos(x) = cos(-x)

sin(x) = -sin(-x)

The above equations are true for any real value of x. Identities are sometimes written with a "triple equals sign", as in 3 parallel lines rather than 2.

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