Answer
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.
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 2 - Section 2.1 - Definition II: Right Triangle Trigonometry - 2.1 Problem Set - Page 61: 4
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