Differentiation rules
The reciprocal rule

The derivative of h (x) = 1 f (x) {\displaystyle h(x)={\frac {1}{f(x)}}} for any (nonvanishing) function f is:

In Leibniz's notation, this is written

The reciprocal rule can be derived either from the quotient rule, or from the combination of power rule and chain rule.
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