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Sin() function takes an angle in radiant unit and returns sinus of angle. Declaration of Sin() as follows:
function sin(const angle:extended):extended;
Return value will be between 0.0-1.0
(Known issues / Documentation clarifications / Things to be aware of)
var an_angle,sinus:extended; ... an_angle:=0.25*pi; sinus:=sin(an_angle);
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