Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 4 - Section 4.3 - Right Triangle Trigonometry - Exercise Set - Page 560: 13



Work Step by Step

Convert the angle measure to degrees by multiplying $\dfrac{180^o}{\pi}$ to obtain: $\dfrac{\pi}{3} \cdot \dfrac{180^o}{\pi} = 60^o$ RECALL: (1) $\sin{\theta} = \dfrac{\text{opposite side}}{\text{hypotenuse}}$ (2) $\tan{\theta} = \dfrac{\text{opposite side}}{\text{adjacent side}}$ (3) $\cos{\theta} = \dfrac{\text{adjacent side}}{\text{hypotenuse}}$ (4) $\sec{\theta} = \dfrac{\text{hypotenuse}}{\text{adjacent}}$ (5) $\csc{\theta} = \dfrac{\text{hypotenuse}}{\text{opposite side}}$ Use formula (2) above. Use the 60-degree angle of the triangle on the right to obtain: $\tan{\frac{\pi}{3}} = \tan{60^o} = \dfrac{\sqrt3}{1}=\sqrt3$
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