08-14-2019, 04:08 PM
Hi, ijabbott
I am reading Trigonometric Delights, by Eli Maor.
Chapter 4, Trigonometry becomes Analytic, page 53:
I am reading Trigonometric Delights, by Eli Maor.
Chapter 4, Trigonometry becomes Analytic, page 53:
Quote:Euler and his Introductio to fully incorporate complex numbers into trigonometry: with him the subject becomes truly analytic.
These developments moved trigonometry ever farther from its original connection with a triangle.
The first to define the trigonometric functions as pure numbers, rather than ratios in a triangle ...
Today, of course, we go a step farther and define the independent variable itself as a real number rather than an angle.