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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def truncate(num, precision=0):
 """Deprecated, use decimal_to_precision instead"""

        if precision > 0:
            decimal_precision = math.pow(10, precision)
            return math.trunc(num * decimal_precision) / decimal_precision
        return int(Exchange.truncate_to_string(num, precision))