Let \(f\) be a differentiable function satisfying the condition \(f(y)\cdot f(x - y) = f(x)\)

It is given that \(f'(0)=p, \quad f'(5)=q\)

Then find \(f'(-5)\).

**Details and Assumptions**:-

- \(f'(x) = \dfrac{d(f(x))}{dx}\) , \(f'(k)\) is value of \(\frac{d(f(x))}{dx}\) at \(x=k\),

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