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Coolmath Precalculus Review Calculus Preview
Lesson 30 - Trigonometry - Other Trig Identities to Know (page 1 of 1)
---- This Precalculus review (Calculus preview) lesson reviews the other trigonometric identities to know for Calculus.

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Here are the identities I've already mentioned:

Here are the others that come up a lot:

cos( 2 * theta ) = cos^2( theta ) - sin^2( theta ) ... = 2cos^2( theta ) - 1 ... = 1 - 2sin^2( theta )
Notice that these go in alphabetical order!
Also, the cosine guys are in the first position on both
and the sine guys are in the second position on both.

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