Cos 2cos 1x sin 1x

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Cos 2cos 1x sin 1x

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Cos 2cos 1x sin 1x

In mathematics, an "identity" is an equation which is always true, regardless of the specific value of a given variable. Need a custom math course? K12 College Test Prep. Logically, mathematical identities are tautologies; that is, they are expressions which restate the same expression in a different way. In other words, the identities allow you to restate a trig expression in a different format, but one which has the exact same value. There are loads of trigonometric identities, but the following are the ones you're most likely to see and use. Notice how a "co- something " trig ratio is always the reciprocal of some "non-co" ratio. You can use this fact to help you keep straight that cosecant goes with sine and secant goes with cosine. The following particularly the first of the three below are called "Pythagorean" identities. Note that the three identities above all involve squaring and the number 1.

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