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GATE ECE 2019 | Question: 26

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Consider a differentiable function $f(x)$ on the set of real numbers, such that $f(-1)=0$ and $ \mid f’(x) \mid \leq 2.$ Given these conditions, which one of the following inequalities is necessarily true for all $x \in[-2,2]?$

  1. $f(x)\leq \frac{1}{2} \mid x+1 \mid$
  2. $f(x)\leq 2  \mid x+1 \mid $
  3. $f(x)\leq \frac{1}{2} \mid x \mid$
  4. $f(x)\leq 2 \mid x \mid$

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