Answer
(a)
Work Step by Step
Since the sum of the interior angles of a triangle is $180$, then in a right triangle any other angle $\theta$ should satisfy
$$0\lt\theta\lt \pi/2$$
so the right answer is (a).
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 1 - Precalculus Review - 1.4 Trigonometric Functions - Preliminary Questions - Page 29: 4
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