#### Answer

$$1$$

#### Work Step by Step

Use the Pythagorean Identity
$$1+\tan^{2}\theta=\sec^{2}\theta$$
to obtain
$$\sec^{2}\theta-\tan^{2}\theta=(1+\tan^{2}\theta) - \tan^{2}\theta=1.$$

Published by
Prentice Hall

ISBN 10:
0133186024

ISBN 13:
978-0-13318-602-4

$$1$$

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