Answer
a. $ a/c $
b. $\sqrt {1-b^2/c^2}$
Work Step by Step
a. Express sin A in terms of a and c.
$ sin(A)=a/c $
b. Express sin A in terms of b and c.
$ sin(A)=a/c=\sqrt {c^2-b^2}/c=\sqrt {1-b^2/c^2}$
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 1: Functions - Practice Exercises - Page 38: 64
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