Consider [t] denotes the greatest integer less than or equal to t. Let Then h is
continuous in [-2,2] but not differentiable at 7 points in (-2,2)
continuous in [-2,2] but not differentiable at exactly 4 points in (-2,2)
not continuous at exactly four points in [-2,2]
not continuous at exactly three points in [-2,2]
We have, f(x) = x – [x] = {x}, g(x) = 1 – (x – [x]) = 1 – {x}, and h(x) = min {f(x), g(x)}
h(x) is continuous in [–2, 2] but not differentiable at 7 points in (–2, 2).
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