Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 29: 97



Work Step by Step

1. Lets find the values of given trig functions $\sin (-90)^{\circ}=-1$ $\cos(-90)^{\circ}=0$ 2.Substitute the values in the original expression: $(-1)^{2}+(0)^{2}=1$
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