Find the quotient z subscript 1 over z subscript 2 of the complex numbers z subscript 1 equals 15 open parentheses cos fraction numerator 7 straight pi over denominator 6 end fraction plus i sin fraction numerator 7 straight pi over denominator 6 end fraction close parentheses and z subscript 2 equals 10 open parentheses cos straight pi over 3 plus i sin straight pi over 3 close parentheses, then write the result in rectangular form