In this Section we see how the equations of the tangent line and the normal line at a particular point on the curve y = f ( x ) can be obtained. The equations of tangent and normal lines are often written as

y = m x + c , y = n x + d

respectively. We shall show that the product of their gradients m and n is such that m n is 1 which is the condition for perpendicularity.


Learning Outcomes

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