(5/x²+4*eˣ/⁴)`=(5*x⁻²+4*eˣ/⁴)`=5*(-2)*x⁽⁻²⁻¹⁾+4*eˣ/⁴*(x/4)`=
=-10x⁻³+4*eˣ/⁴*(1/4)=eˣ/⁴-10/x³.
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(5/x²+4*eˣ/⁴)`=(5*x⁻²+4*eˣ/⁴)`=5*(-2)*x⁽⁻²⁻¹⁾+4*eˣ/⁴*(x/4)`=
=-10x⁻³+4*eˣ/⁴*(1/4)=eˣ/⁴-10/x³.