These straightforward expressions usually do not exist for other angles which are rational multiples of the proper angle. e i x = cos ⁡ x + i sin ⁡ x e − i x = cos ⁡ x − i sin ⁡ x . displaystyle start out aligned e^ ix https://tanning03570.review-blogger.com/52354189/the-definitive-guide-to-austin