f(x)=3loge(x−1)−3loge(x+1)−x−12
f′(x)=x−13−x+13+(x−1)22
f′(x)=(x−1)2(x+1)4(2x−1)
f′(x)≥0
⇒x∈(−∞,−1)∪[21,1)∪(1,∞) or (−∞,−1)∪([21,∞)−1)
JEE Main 2021 — Mathematics Calculus
Let f be a real valued function, defined onR−−1,1 and given by f(x)=3loge∣x+1x−1∣−x−12. Then in which of the following intervals, function f(x) is increasing?
Held on 16 Mar 2021 · Verified 6 Jul 2026.
(−∞,−1)∪([21,∞)−1)
(−∞,∞)−−1,1
(−1,21]
(−∞,21]−−1
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