Answer
$\sin\theta=\frac{s}{L_{2}}$
Work Step by Step
In the right triangle $BDC$, with hypotenuse $CD=L_2$ and a leg $BC=s$, using the definition of sine it follows:
$$\sin\theta=\dfrac{BC}{CD}=\dfrac{s}{L_{2}}$$
Calculus with Applications (10th Edition)
by Lial, Margaret L.; Greenwell, Raymond N.; Ritchey, Nathan P.
Published by
Pearson
ISBN 10:
0321749006
ISBN 13:
978-0-32174-900-0
Chapter 13 - The Trigonometric Functions - Chapter Review - Review Exercises - Page 702: 87
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