→ CaptainH :照定義做就可以了 10/16 18:18
→ CaptainH :f'(x) = lim [ f(x+h) - f(x) ] / h as h→0 10/16 18:18
Suppose f is a function that satifies the equation
f(x+y)=f(x)+f(y)+x平方y+xy平方
for all real numbers x and y.Suppose also that
lim f(x)/x =1
find f'(x)
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