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We initially defined trigonometric functions of angles. Now, we extend that definition
to real numbers, so that it makes sense to talk about, for example, the sine of the number
40 or the cosine of the number pi or the tangent of the number e.
Prof. Serna. Math, Statistics & Physics Tutor. Miami.
10300 SW 72nd Street, Suite 460-5, Miami, FL 33173.