1
WB JEE 2017
MCQ (More than One Correct Answer)
+2
-0
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Let f be a non-constant continuous function for all x $$ \ge $$ 0. Let f satisfy the relation f(x) f(a $$-$$ x) = 1 for some a $$ \in $$ R+. Then, $$I = \int_0^a {{{dx} \over {1 + f(x)}}} $$ is equal to
A
a
B
$${a \over 4}$$
C
$${a \over 2}$$
D
f(a)
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