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Let f(x) = {{:(sgn(x)+x",",-oo lt x lt 0...

Let `f(x) = {{:(sgn(x)+x",",-oo lt x lt 0),(-1+sin x",",0 le x le pi//2),(cos x",",pi//2 le x lt oo):}`, then number of points, where f(x) is not differentiable, is/are

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