Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 10 - Geometry - 10.6 Right Triangle Trigonometry - Exercise Set 10.6 - Page 668: 62

Answer

The tangent of an angle approaches to \[\text{infinity}\]as it gets closer to \[90{}^\circ \].

Work Step by Step

The trigonometric ratio for \[\text{Tan }A\] is determined by dividing the opposite side of \[\text{angle }A\]with the adjacent side of the triangle. It can be expressed in the form of equation as follows: \[\text{Tangent }A=\frac{\text{Opposite side of angle }A}{\text{Adjacent side of angle }A}\] The function of tangent can also be expressed in the form of \[\text{sine}\]and \[\text{cosine}\]as follows: \[\text{Tangent }A=\frac{\text{Sin }A}{\text{Cos }A}\] Since, the value of \[\text{Cos }90{}^\circ \] is\[0\] and the value of \[\text{Sin }90{}^\circ \] is\[1\]. On putting the value of \[\text{Sin }90{}^\circ \]and \[\text{Cos }90{}^\circ \]in the aforesaid tangent function, the value of tangent will ultimately be not defined or infinity. Hence, the value of tangent at \[0{}^\circ \] is zero, but as it approaches to\[90{}^\circ \], the value of tangent tends to\[\text{infinity}\].
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