Apply limit laws to evaluate or show that the limit does not exist.

limCos (π + ∆ x) +1

∆x -> 0 ∆x

I started like this but It didnt go anywhere:

limCos (π + ∆ x) +1 . Cos (π + ∆ x) -1= limCos (π + ∆ x)^2 -1

∆x -> 0 ∆x Cos (π + ∆ x) -1 ∆x -> 0 ∆x(Cos(π + ∆ x) -1

please help me thanks[IMG]file:///C:/DOCUME%7E1/Shayan/LOCALS%7E1/Temp/moz-screenshot-5.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/Shayan/LOCALS%7E1/Temp/moz-screenshot-6.jpg[/IMG]