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## Homework Statement

Given that y = lnsecx, - pi/2 <=x<=0, use the substituation u = secx, or otherwise, to show that dy/dx = tan x.

## The Attempt at a Solution

well i thought about using the product rule, but you as it's ln(secx) not lnxsecx (2 different functions).... soooo im all out of ideas :(

Thanks :)