原题再现(人教大纲第三册选修Ⅱ)P121求曲线y=x3+x2-1在点P(-1,-1)处的切线方程.分析我们知道,若P和Q是曲线C上邻近的两点,P为定点,当Q点沿着曲线C无限地接近P点时,割线PQ的极限位置PT叫做曲线C在点P的切线,P点叫做切点;切点是切线和曲线的公共点,且切线的斜率就是导函数在切点处的函数值.求曲 Reproduce the original title (Personal Education Outline Book III elective II) P121 find the tangent equation of the curve y=x3+x2-1 at point P(-1,-1). Analyze we know that if P and Q are on curve C In the two adjacent points, P is the fixed point. When the Q point approaches the P point indefinitely along the curve C, the extreme position PT of the secant PQ is called the tangent of the curve C at the point P, and the point P is called the tangent; the tangential point is the tangent and The common point of the curve, and the slope of the tangent is the function value of the derivative function at the point of inflection.