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Solution 4.2:5c
From Förberedande kurs i matematik 1
If we express the angle
\displaystyle \text{33}0^{\circ }=\text{33}0^{\circ }\centerdot \frac{\pi }{180^{\circ }}
radians
\displaystyle =\frac{11\pi }{6}
radians
and from exercise 3.3:1g, we know that
\displaystyle \cos 330^{\circ }=\cos \frac{11\pi }{6}=\frac{\sqrt{3}}{2}.
