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求f(x)=x^3-x的導數為f'(x)=3x^2-1,在x=t處切線斜率為k=3t^2-1. 函數過點(t,t^3-t),代入y=kx+b得知b=-2t^3. 所以要求的方程為y=(3t^2-1)x-2t^3
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