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Let f(x) = (x)/(sqrt(a^(2) + x^(2)))- (...

Let `f(x) = (x)/(sqrt(a^(2) + x^(2)))- (d-x)/(sqrt(b^(2) + (d-x)^(2))), x in R`, where a, b and d are non-zero real constants. Then, (A) `f` is an increasing function of x (B) `f'` is not a continuous function of x (C) `f` is a decreasing function of x (D) `f` is neither increasing nor decreasing function of x

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