# Math help!

Find the derivative of tan(ln(5x))

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1. let z = ln(5x)

d/dx tan z = sec^2 z dz/dx

but dz/dx = d/dx ln(5x) = (1/5x)5 = 1/x

so
(1/x)sec^2(ln(5x))

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posted by Damon

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