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Trigonometric Functions
Syntax
cos(x)
sin(x)
tan(x)
acos(x)
asin(x)
atan(x)
atan2(y, x)
Description
These functions give the obvious trigonometric functions. They
respectively compute the cosine, sine, tangent, arc-cosine, arc-sine,
arc-tangent and arc-tangent of two arguments.