Solution 4.2:5c
From Förberedande kurs i matematik 1
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- | If we express the angle | + | If we express the angle 330° in radians, we obtain |
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- | in radians, we obtain | + | |
+ | {{Displayed math||<math>330^{\circ} = 330^{\circ}\cdot \frac{\pi}{180^{\circ}}\ \text{radians} = \frac{11\pi}{6}\ \text{radians}</math>}} | ||
- | + | and from exercise 3.3:1g, we know that | |
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- | + | {{Displayed math||<math>\cos 330^{\circ} = \cos \frac{11\pi}{6} = \frac{\sqrt{3}}{2}\,\textrm{.}</math>}} | |
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- | <math>\cos 330^{\circ }=\cos \frac{11\pi }{6}=\frac{\sqrt{3}}{2}</math> | + |
Current revision
If we express the angle 330° in radians, we obtain
\displaystyle 330^{\circ} = 330^{\circ}\cdot \frac{\pi}{180^{\circ}}\ \text{radians} = \frac{11\pi}{6}\ \text{radians} |
and from exercise 3.3:1g, we know that
\displaystyle \cos 330^{\circ} = \cos \frac{11\pi}{6} = \frac{\sqrt{3}}{2}\,\textrm{.} |