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Given f (x) = x / x-a (≠ a), if a = - 2, we try to prove that f (x) increases monotonically in X ≤ - 2
f(x)=x/x-a=（x-a+a)/(x-a)=1+a/(x-a)
a=-2,f(x)=1-2/(x+2)
X is not equal to a, X
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