If x+y = 12 and xy = 27 then find the value of x 3 + y 3
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(x+y)^3=x^3+y^3+3xy (x+y)
(12)^3=x^3+y^3+3*27*12
x^3+y^3=756
(12)^3=x^3+y^3+3*27*12
x^3+y^3=756
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