cos(55) = 0.022126756261956
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0.5735764264 (nearest 10 decimal places).
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).
-1<cosine<1
The Y-Intercept of the cosine function is X = 0, Y = cosine(0) = 1.
The cosine of 0.57 degrees is 0.999951. The cosine of 0.57 radians is 0.841901