Cos(0) = 1
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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).
60 degrees = 0.5 1/2
The Y-Intercept of the cosine function is X = 0, Y = cosine(0) = 1.
cos(37 deg) = 0.7986
As a decimal: 0.866 As a fraction: √(3)/2