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2.导数的几何意义 函数y=f(x)在点x0处的导数的几何意义是曲线y=f(x)在点P(x0,f(x0))处的切线的斜率.也就是说,曲线y=f(x)在点P(x0,f(x0))处的切线的斜率是f'(x0).相应地,切线方程为y-f(x0)=f'(x0)(x-x0).