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## Main Question or Discussion Point

In one physics problem if $$r^2= \lambda^2(1+\frac{m}{2\lambda})^2$$

what is ##dr^2 ?##

Should I find ##dr## starting from ##r= \lambda(1+\frac{m}{2\lambda})## first and then square or find ##dr^2## starting from r^2? I know this is a basic question in differentiation using chain rule but it seems I am stuck over this..

what is ##dr^2 ?##

Should I find ##dr## starting from ##r= \lambda(1+\frac{m}{2\lambda})## first and then square or find ##dr^2## starting from r^2? I know this is a basic question in differentiation using chain rule but it seems I am stuck over this..

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