cos(60) = -0.95241298
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I can answer if you tell me what cos means.
Cos(60) = -0.95241 assuming that angles are measured in radians, as would be done by most mathematicians. If they are measured in degrees, the answer is 0.5
cos(60) = 0.57 x 60 x cos(60) = 7 x 30 = 210
Cos(22.5)=0.9238795325
The cos of 2pi is 360 degrees which is 1.