Answer
1
Work Step by Step
1. Lets find the values of given trig functions
$\sin (-180)^{\circ}=0$
$\cos(-180)^{\circ}=-1$
2.Substitute the values in the original expression:
$(-1)^{2}+(0)^{2}=1$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
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: 98
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