Solution 4.2:5c
From Förberedande kurs i matematik 1
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| - | {{ | + | If we express the angle 330° in radians, we obtain |
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| - | {{ | + | {{Displayed math||<math>330^{\circ} = 330^{\circ}\cdot \frac{\pi}{180^{\circ}}\ \text{radians} = \frac{11\pi}{6}\ \text{radians}</math>}} |
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| + | 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>}} | ||
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{.} |
