Chapter 2 - Section 2.1 - Definition II: Right Triangle Trigonometry - 2.1 Problem Set: 4

sine - cosine secant - cosecant tangent - cotangent

Work Step by Step

Sine and cosine are cofunctions, as are tangent and cotangent, and secant and cosecant. We say sine is the cofunction of cosine, and cosine is the cofunction of sine.

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