1/3(a-b)^2*6(b-a)^3*5/2(b-a)^4
=(1/3)*6*(5/2)*(a-b)^2*[-(a-b)^3]*(a-b)^4
=-5*(a-b)^9
1/3(a-b)^2*6(b-a)^3*5/2(b-a)^4,
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