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## Homework Statement

find the derivative of the function

f(x)=arcsec(4x)

## Homework Equations

I think this is a Relevant equations.

d/dx[arcsecu]=u'/(|u|(√u

^{2}-1)

## The Attempt at a Solution

f'(x)=4/(|4|(√4

^{2}-1)

=1/√15

I keep getting wrong in my online homework why?