Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 3 - Radian Measure and the Unit Circle - Section 3.1 Radian Measure - 3.1 Exercises - Page 105: 65


$\sin30\approx-0.9880$ whereas $\sin 30^{\circ}=\frac{1}{2}$

Work Step by Step

It is true that $\sin 30^{\circ}=\frac{1}{2}$. However, the expression in the question is not $\sin 30^{\circ}$,rather it is $\sin 30$. This means that the '$30$' in the expression refers to radians, not degrees. Using a calculator, $\sin30$ is found to be approximately equal to $-0.9880$.
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