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((x-5)*(x+9))'The calculation above is a derivative of the function f (x)
(x-5)'*(x+9)+(x-5)*(x+9)'
((x)'+(-5)')*(x+9)+(x-5)*(x+9)'
((-5)'+1)*(x+9)+(x-5)*(x+9)'
(0+1)*(x+9)+(x-5)*(x+9)'
1*(x+9)+(x-5)*(x+9)'
1*(x+9)+(x-5)*((x)'+(9)')
1*(x+9)+(x-5)*((9)'+1)
1*(x+9)+(x-5)*(0+1)
1*(x+9)+(x-5)*1
2*x+4
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