Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 13, Trigonometric Ratios and Functions - 13.3 Evaluate Trigonometric Functions of Any Angle - 13.3 Exercises - Skill Practice - Page 871: 13

Answer

$\sin 90^{\circ}=1$ $\cos 90^{\circ}=0$ $\tan 90^{\circ}=\infty$ (undefined) $\csc 90^{\circ}= 1$ $\sec 90^{\circ}=\infty$ (undefined) $\cot 90^{\circ}=0$

Work Step by Step

When $\dfrac{\pi}{2}=\dfrac{\pi}{2} \times \dfrac{180}{\pi}=90^{\circ}$ The Trigonometric Identities can be defined as: $\sin 90^{\circ}=1$ $\cos 90^{\circ}=0$ $\tan 90^{\circ}=\infty$ (undefined) $\csc 90^{\circ}= 1$ $\sec 90^{\circ}=\infty$ (undefined) $\cot 90^{\circ}=0$
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