MAT 1300 Lecture Notes - Lecture 7: Product Rule, Inflection, Power Rule

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MAT 1300 Full Course Notes
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MAT 1300 Full Course Notes
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Learning goals for this lesson: understand the chain rule, introduction to implicit differentiation. Geometrically, the first derivative measures the slope of the tangent line (in other words, it measures the rate of change) The second derivative determines if the original function, f(x), is concave up or concave down (http://mathsfirst. massey. ac. nz/calculus/sign2ndder/sign2derpoi. htm) Calculation rules: linearity, power rule, exponential/log rules, product/quotient rules, *new* chain rule (this is an advanced technique) Ex: calculate f1(x) by definition if f(x)= 2x2+2. =lim 2(x+h)2 +2 (2x2+2) side: expand the brackets h 0 h. =lim 2(x2+xh+xh+h2) +2- (2x2+2) distribute the 2 into the bracket h 0 h. =lim (2x2+2xh+2xh+2h2)+2- (2x2+2) many variables cancel out h 0 h. =lim h(4x + 2h) the h"s cancel out h 0 h. =lim 4x+2h sub 0 in for h x 0. Concavity & inflection reminder (http://ltcconline. net/greenl/courses/105/curvesketching/sectst. htm) (calaway, hoffman, lippman. The chain rule deals with the composition of f and g, (f g)1.

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