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((1/4)*e^x-x)'The calculation above is a derivative of the function f (x)
((1/4)*e^x)'+(-x)'
(1/4)'*e^x+(1/4)*(e^x)'+(-x)'
0*e^x+(1/4)*(e^x)'+(-x)'
0*e^x+(1/4)*ln(e)*e^x+(-x)'
0*e^x+(1/4)*e^x+(-x)'
1/4*e^x-1
(1/4)*e^x-1
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