Find the value of e6degi × e9degi × e13degi × e17degi (where deg = degree)
e6degi × e9degi × e13degi × e17degi
= e(6deg+9degi+13degi+17degi)
=e45degi
45deg can also be written as π4
= eiπ4
=cos π4 + i sin π4
= (1+i√2)