[微分]

[king911015 (早已放棄愛上你)]

The tangent line of f(x)=x^3-2x^2+x+1 is  parallel to y=5x+3
at x=?




lim  e^x + e^-x - x^2 - 2
x->0 ---------------------
       sin^2x - x^2

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