Saturday, November 22, 2008

Equations of Tangent and Normal

Equation of tangent at point P(x1,y1).

y-y1 = (dy/dx)(x-x1) {dy/dx is at point P)

Equation of normal at point P(x1,y1).

y-y1 = - [1/(dy/dx)](x-x1) {dy/dx is at point P)

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