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Cos(22.5)=0.9238795325
If the angles are measured in radians then the answer is -0.2678
cos(22) is a trigonometric ratio and, if the angle is measured in degrees, its value is 0.9272
cos pi over four equals the square root of 2 over 2 This value can be found by looking at a unit circle. Cos indicates it is the x value of the point pi/4 which is (square root 2 over 2, square root 2 over 2)
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