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प्रश्न
Examine the differentiability of functions in R by drawing the diagram
|cos x|
आकृती
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उत्तर
|cos x| = f(x)
Limit exist and continuous for all x ∈ R clearly, differentiable at `"R" {(2"n" + 1)π/2, "n" ∈ "z"}` Not differentiable at x = `(2"n" + 1) π/2`, n ∈ Z.
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