Question

lim x-> pi/4 of (1-tanx)/(sinx-cosx)

Answer 1

Are you allowed to use L'hospital's Rule? If so, use it.

Answer 2

i have no idea what that is

Answer 3

Then I guess you aren't.
Try multiplying both numerator and denominator by cos(x).

Answer 4

mess around with the expression until you turn it in to \(-\frac{1}{\sin(x)}\)

Answer 5

okay i know tan x = sins/cos x

Answer 6

so 1- (sinx/ cos x)/ sinx- cos x