The cosine of 20 degrees is 0.93969262
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cos20 x cos40 x cos80 = 0.0300 radians = 0.125 degrees (the value for radians is given to four decimal places, the value in degrees is exact)
The value is 0.
The exact value is 0.5*sqrt(3)
All six trigonometric functions can take the value 1.
1