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Basic trigonometric identitiesThese formulas are very important. You shouldn't go any farther without knowing them. If you already know them, you can go ahead and continue to the next page. Quotient Identities
Quotient IdentitiesReciprocal IdentitiesPythagorean IdentitiesEvenOdd IdentitiesDerived formulas, if k is an odd integer, , if k is an even integer. 

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