I have a limit question on my homework that I don't know how to do.
The limit represents the derivative of some function f(x) at some number a.
lim (tan(x) - 1) / ( x - (π/4))
x →π/4
I have to select all appropriate f(x) and a from a list that was given for the answer. The list was:
f(x) = tan(x), a = π/4
f(x) = tan(x), a = π
f(x) = tan(x) - 1, a = π
f(x) = tan(x), a = 1/4
f(x) = tan(x) - 1, a = 1/4
None of these
How would I solve this question? Thanks in advance.