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Returns the arc cosine of a given number.
number:acos(FLOAT $number) : FLOAT
number:acos(0.64) #=> 1.5707963267948966 number:acos(0) #=> 1.5707963267948966 number:acos(1) #=> 0.0 number:acos(-1) #=> 3.141592653589793 number:acos(2) #=> NAN
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