Answer
$\frac{4}{5}$
Work Step by Step
Recall: $\cos(\arcsin x)=\sqrt {1-x^{2}}$
$\implies \cos(\arcsin \frac{3}{5})=\sqrt {1-(\frac{3}{5})^{2}}=\frac{4}{5}$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 5 - Section 5.4 - Half-Angle Formulas - 5.4 Problem Set - Page 305: 58
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