Chapter 5: Problem 35
Find the area of a regular hexagon with sides of length \(s\).
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Chapter 5: Problem 35
Find the area of a regular hexagon with sides of length \(s\).
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Find angles \(u\) and \(v\) such that \(\sin (2 u)=\sin (2 v)\) but \(|\sin u| \neq|\sin v|\).
Give an example of an angle \(\theta\) such that both \(\sin \theta\) and \(\sin (2 \theta)\) are rational.
Evaluate the indicated expressions assuming that $$ \begin{array}{ll} \cos x=\frac{1}{3} & \text { and } \sin y=\frac{1}{4} \\ \sin u=\frac{2}{3} & \text { and } \cos v=\frac{1}{5} \end{array} $$ Assume also that \(x\) and \(u\) are in the interval \(\left(0, \frac{\pi}{2}\right),\) that \(y\) is in the interval \(\left(\frac{\pi}{2}, \pi\right),\) and that \(v\) is in the interval \(\left(-\frac{\pi}{2}, 0\right) .\) $$\sin (x+y)$$
Show that $$\sin (3 \theta)=3 \sin \theta-4 \sin ^{3} \theta$$ for all \(\theta\).
Evaluate the indicated expressions assuming that $$ \begin{array}{ll} \cos x=\frac{1}{3} & \text { and } \sin y=\frac{1}{4} \\ \sin u=\frac{2}{3} & \text { and } \cos v=\frac{1}{5} \end{array} $$ Assume also that \(x\) and \(u\) are in the interval \(\left(0, \frac{\pi}{2}\right),\) that \(y\) is in the interval \(\left(\frac{\pi}{2}, \pi\right),\) and that \(v\) is in the interval \(\left(-\frac{\pi}{2}, 0\right) .\) $$\tan (u+v)$$
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