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B
Monotonically decreasing in (−12,0)∪(12,∞)
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C
Monotonically increasing in (−∞,−12)∪(0,12)
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D
Monotonically decreasing in (−∞,−12)∪(0,12)
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Solution
The correct options are A Monotonically increasing in (−12,0)∪(12,∞) D Monotonically decreasing in (−∞,−12)∪(0,12) f′(x)=4x−1x=(2x+1)(2x−1)x f is increasing ⇒f1(x)>0 f is decreasing ⇒f1(x)>0