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Let f(x) = max {2 sin x, 1 -cos x}, x in...

Let `f(x) = max {2 sin x, 1 -cos x}, x in (0,pi)`, then the set of points of non differentiability are (A) `phi` (B) `pi/2` (C) `{pi-cos^-1(3/5)}` (D) `{cos^-1(3/5)}`

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