Unformatted text preview: ' to denote a change and start using the letter d to denote an infinitesimally small change. Ƈ Ƈ Ƈ calculus tricks – an easy way to find derivatives For the purposes of this course, there are only three calculus rules you’ll need to know: x the constantfunction rule x the powerfunction rule and x the sumdifference rule. the constantfunction rule If + , 3 x f , then the value of + , x f doesn’t change x as changes – i.e. + , x f is constant and equal to 3. So what’s the slope? Zero. Why? Because a change in the value of x doesn’t change the value of + , x f . In other words, the change in the value of + , x f is zero. So if + , 3 x f , then + , + , x f x d x f d c . Page 19...
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 Fall '10
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 Calculus, Derivative, inﬁnitesimally small changes

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