Teaching DSSSB TGT Mock Test 2025 Mathematics Limit and Continuity

Let [ ] denote the greatest integer function and f(x) = [tan2x]. Then:

1
lim f(x) does not exist x → 0
2
f(x) is continuous at x = 0
3
f(x) is not differentiable at x = 0
4
f' (0) = 1
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