Let f(x) = ${x \over {\sqrt {{a^2} + {x^2}} }} - {{d - x} \over {\sqrt {{b^2} + {{\left( {d - x} \right)}^2}} }},\,\,$ x $\, \in $ R, where a, b and d are non-zero real constants. Then :
f is an increasing function of x
f is neither increasing nor decreasing function of x
f ' is not a continuous function of x
f is a decreasing function of x
Solution
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