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The smallest positive number $K$ for which the inequality $\mid \sin ^2 x – \sin ^2 y \mid \leq K \mid x-y \mid$ holds for all $x$ and $y$ is

  1. $2$
  2. $1$
  3. $\frac{\pi}{2}$
  4. there is no smallest positive value of $K$; any $K>0$ will make the inequality hold.
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