#### 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}$

Published by
Pearson

ISBN 10:
0-32187-896-5

ISBN 13:
978-0-32187-896-0

a. $ a/c $
b. $\sqrt {1-b^2/c^2}$

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