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[king911015 (早已放棄愛上你)]

For what value or values of the constant K will the curve
y=X^3+kX^2+3X-4 have exactly one horizontal tangent?




Suppose a,b are constants such that lim    sin2x     a
                                    x->0 (------- + ---- + b )=0
                                            x^3      x^2
then a+b =?

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