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

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