Answer
$1$
Work Step by Step
For every values of $\theta$
$\left( \sin \theta \right) ^{2}+\left( \cos \theta \right) ^{2}=1$
So
$\left( \sin 60\right) ^{2}+\left( \cos 60\right) ^{2}=1$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 6 - Section 6.2 - Trigonometry of Right Triangles - 6.2 Exercises - Page 488: 32
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