Question
Question: The function f(x) = cot<sup>–1</sup>x + x increases in the interval :...
The function f(x) = cot–1x + x increases in the interval :
A
(1, )
B
(–1, )
C
(– ,)
D
) (0, )
Answer
(– ,)
Explanation
Solution
f ¢(x) = –
+ 1
f '(x) = 
Ž f ¢(x) ³ 0
Ž Always increasing