Trigonometry 7th Edition

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 62: 28

Answer

$78^{\circ}$ $ \cot 12^{\circ} = \tan 78^{\circ}$

Work Step by Step

$ \cot 12^{\circ} = \tan 78^{\circ}$ Reason- cotangent and tangent are cofunctions and $ 12^{\circ} + 78^{\circ} = 90^{\circ}$ i.e. $12^{\circ}$ and $ 78^{\circ}$ are complementary angles.
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