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# nedd help

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Find the dervative of y with respect to the given independent variable .
y=log2r . Log4r

Sep 11, 2020

Note that $$\frac{dy}{dx}(log_a x)=\frac{1}{x\ln a}$$. So $$\frac{dy}{dr}(log_2 r * log_4 r)=\frac{dy}{dr}(log_2 r)*\frac{dy}{dr}(log_4 r)=\frac{1}{r\ln 2}*\frac{1}{r\ln 4}=\frac{1}{r^2\ln 2\ln 4}$$