Simple Trig Identities. Definition of An Identity. Any equation that is true for every number in the domain of the equation. Example 2x + 12 = 2(x + 6) Trig identities Pythagorean Identities Reciprocal identities Ratio identities. Pythagorean Identities. 90º. (x,y). r. y. θ. 0º.
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