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R я могу сделать так...> f <- expression(a*x^(4/3) * (1-exp(x^(-8/3))))
> D(f,"x");
a * (x^((4/3) - 1) * (4/3)) * (1 - exp(x^(-8/3))) - a * x^(4/3) *
(exp(x^(-8/3)) * (x^((-8/3) - 1) * (-8/3)))
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