For 0 < x < pi. sin(x) is positive,for pi < x < 2*pi, sin(x) is negative
and these intervals can be left or right-shifted by any multiple of 2*pi radians.
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Sine and sign Sine is the mathemtical cyclic wave. The name is shortened to 'Sin'. Sign is to write one's name to a document.
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The amplitude of a sine (or cosine) curve is the difference between the maximum and minimum values of the curve, measured over a whole cycle.
Cosine (0) = 1 Sin(0) = 0 The sine and cosine curves are two intertwining curves, that complement each other, hence the words 'Sine (Curve) and Cosine ( COmplementary Curve).