MonotonicityHard
Question
The function y = 
increases in the interval-
increases in the interval-Options
A.(-∞, 0)
B.(e, ∞)
C.(0, ∞)
D.(-∞, e)
Solution
f(x) = 
f′(x) =
for f(x) to be increasing, so f′(x) > 0
⇒
> 0
⇒ log x > 1
⇒ x > e
⇒ x ∈ (e, ∞)
f′(x) =
for f(x) to be increasing, so f′(x) > 0
⇒
> 0⇒ log x > 1
⇒ x > e
⇒ x ∈ (e, ∞)
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