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单词 ProofOfQuotientRuleusingProductRule
释义

proof of quotient rule (using product rule)


Suppose f and g are differentiable functions defined on some intervalof , and g never vanishes. Let us prove that

(fg)=fg-fgg2.

Using the product ruleMathworldPlanetmath (fg)=fg+fg, and (g-1)=-g-2g,we have

(fg)=(fg-1)
=fg-1+f(g-1)
=fg-1+f(-1)g-2g
=fg-fgg2
=fg-fgg2.

Here g-1=1/g and g-2=1/g2.

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