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The domain of arcsin function is [-1;1] and the range is [-pi/2 ; pi/2].
The argument of the given arcsin function is (1+x)/(1-2x).
We'll impose that -1 =< (1+x)/(1-2x) =< 1
We'll solve double inequality:
-1 =< (1+x)/(1-2x)
(1+x)/(1-2x) + 1 >= 0
(1+x+1-2x)/(1-2x) >= 0
(2-x)/(1-2x) >= 0
For the ratio to be positive, both numerator and denominator has to be positive.
The ratio is positive if x belongs to [-1 ; 1/2).
x is not allowed to be equal with 1/2 since x=1/2 is the root of denominator and the denominator must no be zero.
We'll solve the other inequality:
(1+x)/(1-2x) =< 1
(1+x)/(1-2x) - 1=< 0
The fraction is negative if the numerator and denominator have different signs.
The fraction is negative if x belongs to the interval [-1;1/2)U(1/2;+1].
The domain of the function is [-1 ; 1/2)U(1/2;+1].
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