Mathematics without sin α, cos α (When Angle α is Being Measured in Degrees) and π.
Dr. Donaldas Zanevicius

Abstract
Consequently, the numeral meaning of sina is rounded down twice – the finite number of irrational quantity π after comma is changed into the finite number of figures and a finite figure is taken from sine function endless line. In the case sin and cos are within complex mathematical expressions, the methods of analytical calculating cannot be used, because sin and cos have no analytical expressions.

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