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(x1+x2)^2 = x1^2 + x2^2 + 2.x1.x2
36 = 4 + 2.x1.x2
32 = 2.x1.x2
x1.x2 = 16
x1^3.x2 + x1.x2^3 = x1.x2(x1^2 + x2^2)
= 16.(4)
= 64