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((x+1)*(x+2))'The calculation above is a derivative of the function f (x)
(x+1)'*(x+2)+(x+1)*(x+2)'
((x)'+(1)')*(x+2)+(x+1)*(x+2)'
((1)'+1)*(x+2)+(x+1)*(x+2)'
(0+1)*(x+2)+(x+1)*(x+2)'
1*(x+2)+(x+1)*(x+2)'
1*(x+2)+(x+1)*((x)'+(2)')
1*(x+2)+(x+1)*((2)'+1)
1*(x+2)+(x+1)*(0+1)
1*(x+2)+(x+1)*1
2*x+3
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