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} |
| 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} |
