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[" Suppose a differentiable funtion "f(x...

[" Suppose a differentiable funtion "f(x)" satisfies the identity "],[[" f "(x+y)=f(x)+f(y)+xy^(2)+x^(2)y,AA x,y in R" .If "Lin_(x rarr0)(f(x))/(x)=1," then "f^(1)(3)=," d) "3],[" a) "4," b) "10," c) "8]]

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