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Concept explainers
The “co� in “cosine� comes from “ complementary,� since the cosine of an angle is the sine of the complementary angle, and vice versa:
Suppose that we define a function
Thus, cosine and sine are cofunctions of each other, as are cotangent and tangent, and also cosecant and secant. If
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Chapter 2 Solutions
Calculus: Early Transcendentals, Enhanced Etext
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