<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def __set_formulas(self, formulas):
 """ Sets formulas in this cell range from an iterable. Any cell values can be set using this method. Actual formulas must start with an equal sign. """

        array = tuple((self._clean_formula(v),) for v in formulas)
        self._get_target().setFormulaArray(array)