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JEEMAIN-2014
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Q)
Let
f
(
x
)
be defined for all
x
>
0
and be continued . Let
f
(
x
)
satisfy
f
(
x
y
)
=
f
(
x
)
−
f
(
y
)
for all x,y and f(e)=1$ Then
\begin{array}{1 1} f(x) \;is\;bounded \\ f(\frac{1]{x})=>0\;and\;x=0 \\ xf(x)=>1\;as\;x=0 \\f(x) =\log x \end{array}
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