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Answer 4.1:1
From Förberedande kurs i matematik 1
| a)
| \displaystyle 90^\circ\ and \displaystyle \ \displaystyle \frac{\pi}{2} \textrm{ rad}
| b)
| \displaystyle 135^\circ\ and \displaystyle \ \displaystyle \frac{3\pi}{4} \textrm{ rad}
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| c)
| \displaystyle -240^\circ\ and \displaystyle \ \displaystyle -\frac{4\pi}{3} \textrm{ rad}
| d)
| \displaystyle 2910^\circ\ and \displaystyle \ \displaystyle \frac{97\pi}{6} \textrm{ rad}
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