module BigMath

#=> "0.1414213562373095048801688724e1"
BigMath.sqrt(BigDecimal('2'), 16).to_s

precision, +numeric+.
Computes the square root of +decimal+ to the specified number of digits of

sqrt(decimal, numeric) -> BigDecimal
call-seq:

def sqrt(x, prec)
  x.sqrt(prec)
end