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Let f(x) is a continuous function such...

Let ` f(x)` is a continuous function such that ` f(-1) = -2,f(0) = -1,f(1) = 0,f (2) = 1, f(3) = 0,f (4) = -1 and f(5) = 1 ` then minimum number of roots of ` f'(x) + xf " (x) = 0 ` in the interval ` (-1,5)` are

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