phi = [(1+sqrt(5)]/2 = 1.6180, the golden ratio.
cosine(phi) = -0.0472 approx.
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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).
-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
Cosine(42 radians) = -0.399985 Cosine(42 degrees) = 0.743146