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Let f:""RrarrR be defined by f(x)={(k-2...

Let `f:""RrarrR` be defined by `f(x)={(k-2x , if xle-1),( 2x+3, if x gt-1):}` . If f has a local minimum at `x""=""1` , then a possible value of k is (1) 0 (2) `-1/2` (3) `-1` (4) 1

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