21设函数+f(x)=e^(-x^2)cos1/x+求导数f(x
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f(x)=e^(-x^2)cos1/xf'(x)=[e^(-x^2)]'·cos1/x +e^(-x^2) · [cos1/x]'= -2e^(-x^2) cos1/x+ [ e^(-x^2) sin 1/x] /x²
咨询记录 · 回答于2022-11-02
21设函数+f(x)=e^(-x^2)cos1/x+求导数f(x
f(x)=e^(-x^2)cos1/xf'(x)=[e^(-x^2)]'·cos1/x +e^(-x^2) · [cos1/x]'= -2e^(-x^2) cos1/x+ [ e^(-x^2) sin 1/x] /x²