- #1

kari82

- 37

- 0

can i get help with this?

Find any relative extrema of the function

g(x)=x sech(x)

First i find the derivative

g'(x)=sech(x)(-xtanh(x)+1)

set to 0

sechx=0 can't be solved

-xtanh(x)+1=0

xtanh(x)=1

I know i suppose to solve that to get the critical points and then do the sign test... but i don't know how to solve that equation.

Thanks!