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(x-(0.9*x)+3)'The calculation above is a derivative of the function f (x)
(x-(0.9*x))'+(3)'
(x)'+(-(0.9*x))'+(3)'
(-(0.9*x))'+(3)'+1
0.9*(x)'+(0.9)'*x+(3)'+1
0.9*(x)'+0*x+(3)'+1
0*x+0.9*1+(3)'+1
0+0.1
0.1
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