Trigonmetric functions (not necessary but slightly more convenient).
This class represents a one-dimensional angle (as opposed to a two-dimensional solid angle). It has methods for converting angles to or from radians, degrees, and the E5/E6/E7 representations (i.e. degrees multiplied by 1e5/1e6/1e7 and rounded to the nearest integer).
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S1Angle represents a one-dimensional angle (as opposed to a two-dimensional solid angle).