I don't even know where to start with this question
A useful linear approximation to
can be obtained by combining the approximations
1/(1+x) is about equal to 1 - x and tan x is about equal to x
to get 1/(1+tan x) is about equal to 1-x
Show that this is the standard linear approximation of 1/(1+ tan x)
I'm really slow on this linear approximation stuff. Thanks again for helping me out.