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History of trigonometry begins with the early study of triangles, traced to the 2nd millennium BC, in Ancient Egyptian mathematics (Rhind Mathematical
E (mathematical constant)
introduction to pure analytical mathematics. ...He ...shewed that the trigonometrical and exponential functions were connected by the relation cos θ +
The Early History of Trigonometry (2009) Ch. 3 India, p. 96. The sum and difference formulas are vital to building trigonometric tables finer than the
see that without the knowledge of triangles there is not trigonometry; that without trigonometry we put back the clock millennia to Standard Darkness Time
idea of the logarithm probably had its source in the use of... trigonometric formulas that transformed multiplication into addition and subtraction.