Teaching DSSSB TGT Mock Test 2025 Mathematics Differential Calculus Differentiability

The set of points where \(\rm f(x)=\frac{x}{1+|x|}\) is differentiable, is:

1
(-∞, -1) ∪ (1, ∞)
2
(-∞, ∞)
3
(0, ∞)
4
(-∞, 0) ∪ (0, ∞)
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