Difference between revisions of "Trigonometric identities"

Revision as of 07:28, 24 June 2006

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

$\displaystyle \sin \theta \cos \gamma + \sin \gamma \cos \theta = \sin \left(\theta+\gamma\right)$
$\displaystyle \cos \theta \cos \gamma - \sin theta \sin gamma = \cos \left(\theta+\gamma\right)$
$\displaystyle \frac{\tan \theta + \tan gamma}{1-\tan\theta\tan\gamma}=\tan\left(\theta+\gamma\right)$

(Otherwise known as sum-to-product identities)

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

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 * [[Trigonometric substitution]]
 * [http://www.sosmath.com/trig/Trig5/trig5/trig5.html Trigonometric Identities]
+{{stub}}