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((x+4)*(x+9))'The calculation above is a derivative of the function f (x)
(x+4)'*(x+9)+(x+4)*(x+9)'
((x)'+(4)')*(x+9)+(x+4)*(x+9)'
((4)'+1)*(x+9)+(x+4)*(x+9)'
(0+1)*(x+9)+(x+4)*(x+9)'
1*(x+9)+(x+4)*(x+9)'
1*(x+9)+(x+4)*((x)'+(9)')
1*(x+9)+(x+4)*((9)'+1)
1*(x+9)+(x+4)*(0+1)
1*(x+9)+(x+4)*1
2*x+13
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