Let f(x)=xsinpix ,x > 0. Then for all na...

Let `f(x)=xsinpix ,x > 0.` Then for all natural numbers `n ,f^(prime)(x)` vanishes at (A)a unique point in the interval `(n , n+1/2)` (B)a unique point in the interval `(n+1/2, n+1)` (C)a unique point in the interval `(n , n+1)` (D)two points in the interval `(n , n+1)`

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