Maths-
General
Easy
Question
If 
is independent of x then
- x [1, )
- x [-1, 1]
- x(-, -1] [1, )
- none of these
The correct answer is: x(-, -1] [1, )
|2tan-1 x + sin-1 
|
tan-1x = 
sin-1 = 2tan-1x x
or - 2tan-1x or - - 2 tan-1 x
according as x [1, ) or [-1, 1]
or (-, -1].
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