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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 "L(f(x))/(x rarr0)=1," then "f^(1)(3)=],[" a) "4," b) "10," c) "8," d) "3]]

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