# $\colour{Red}{\textbf{♥}}$

Calculus Level pending

Suppose the $$function$$ $$f(x) - f(2x)$$ has the $$derivative$$ $$5$$ at $$x = 1$$ and $$derivative$$ $$7$$ at $$x = 2$$ . The $$derivative$$ 0f the $$function$$ $$f(x) - f(4x)$$ at $$x = 1$$ ; has value equals to $$?$$

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