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Trigonometric identities

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Trigonometric identities are used to manipulate trig equations in certain ways. Here is a list of them:

$\displaystyle \sin^2x + \cos^2x = 1$
$|1-e^{i\theta}|=2\sin\frac{\theta}{2}$

This page is incomplete--if you know of a trigonometric identity, add it.

See also

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