Teaching DSSSB PGT Mock Test 2025 Mathematics Relations and Functions Domain of a Function

The domain of the function f(x) = \(\rm \frac{1}{\sqrt{|x|-x}}\) is :

1
(0, ∞) 
2
(-∞, 0) 
3
(-∞, ∞) 
4
(-∞, ∞) - {0}
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