Question

чему равна производная in 1x

Answer 1

(ln 1/x)' = (ln1 - lnx)' = (0 - lnx)' = - (lnx)' = - 1/x

Answer 2

$(ln 1x)' = (ln x^{-1})' = (-ln x)' = - frac{1}{x}$

или

$(ln frac{1}{x})' = frac{1}{1/x} * ( frac{1}{x})' = x*(-x^{-2}) = - frac{1}{x}$