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ISI2021-MMA: 29

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Let $f(x-y)=\frac{f(x)}{f(y)}$ for all $x, y \in \mathbb{R}$ and $f^{\prime}(0)=p, f^{\prime}(5)=q$. Then the value of $f^{\prime}(-5)$ is

  1. $q$
  2. $-q$
  3. $\frac{p}{q}$
  4. $\frac{p^{2}}{q}$
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