Returns the arc sine of a given number.

number:asin(FLOAT $number) : FLOAT

number:asin(0.64)
#=> 0.694498265626556

number:asin(0)
#=> 0.0

number:asin(1)
#=> 1.5707963267948966

number:asin(-1)
#=> -1.5707963267948966

number:asin(2)
#=> NAN

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