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Section: Mathematical Functions
Computes the cosine of the argument, but takes the argument in degrees instead of radians (as is the case for cos). The syntax for its use is 
y = cosd(x)
The cosine of 45 degrees should be sqrt(2)/2
--> cosd(45)
ans = 
    0.7071 
and the cosine of 60 degrees should be 0.5:
--> cosd(60)
ans = 
    0.5000