Question

(a-b)^2/ab*(-a/b-a)^3÷1/a^2-b^2

Answer 1

(a-b)^2/ab*(-a/b-a)^3÷1/a^2-b^2
=(a-b)^2/ab*a^3/(a-b)^3(a+b)(a-b)
=a^2(a+b)/b

Answer 2

y'=[(3x-2)^2]'*sin3x+(3x-2)^2*(sin3x)'
=2(3x-2)*(3x-2)'*sin3x+(3x-2)^2*cos3x*(3x)'
=(18x-12)sin3x+3(3x-2)^2*cos3x