=== Экспонента синус и косинус комплексной переменной ===
http{{Определение|definition=<tex> \mathrm{exp}(z) := \sum_{n=0}^{+ \infty} \frac{z^n}{n!} </tex> <tex> \sin(z) := \mathrm{Im}(\mathrm{exp}(z)) </ru.wikipedia.org/wiki/%D0%AD%D0%BA%D1%81%D0%BF%D0%BE%D0%BD%D0%B5%D0%BD%D1%82%D0%B0#.D0.9A.D0.BE.D0.BC.D0.BF.D0.BB.D0.B5.D0.BA.D1.81.D0.BD.D0.B0.D1.8F_.D1.8D.D0.BA.D1.81.D0.BF.D0.BE.D0.BD.D0.B5.D0.BD.D1.82.D0.B0 tex> <tex> \cos(экспронентаz)http://ru.wikipedia.org/wiki/%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%B5_%D1%84%D1%83%D0%BD%D0%BA%D1%86%D0%B8%D0%B8#.D0.A2.D1.80.D0.B8.D0.B3.D0.BE.D0.BD.D0.BE.D0.BC.D0.B5.D1.82.D1.80.D0.B8.D1.87.D0.B5.D1.81.D0.BA.D0.B8.D0.B5_.D1.84.D1.83.D0.BD.D0.BA.D1.86.D0.B8.D0.B8_.D0.BA.D0.BE.D0.BC.D0.BF.D0.BB.D0.B5.D0.BA.D1.81.D0.BD.D0.BE.D0.B3.D0.BE_.D0.B0.D1.80.D0.B3.D1.83.D0.BC.D0.B5.D0.BD.D1.82.D0.B0 = \mathrm{Re}(\mathrm{exp}(синус косинусz))</tex>}}
=== Отображение бесконечно малое в точке ===
