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1. en.wikipedia.org › wiki › List_of_trigonometric_identitiesList of trigonometric identities - Wikipedia

   en.wikipedia.org › wiki › List_of_trigonometric_identities

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   17 godz. temu · For sin, cos and tan the unit-length radius forms the hypotenuse of the triangle that defines them. The reciprocal identities arise as ratios of sides in the triangles where this unit line is no longer the hypotenuse. ... and follows from the equation + = for the unit circle. This equation can be solved for either the sine or the cosine ...