\(\lim\limits_{x\to \frac\pi4} \frac{2 - cosec^2x}{1 - cotx}\) \((\frac 00 - case)\)
\(= \lim\limits_{x\to \frac\pi4} \frac{-2\,cosecx(-cosecx \;cotx)}{-(-cosec^2x)}\) (By D.L.H. Rule)
\(=\lim\limits_{x\to \frac\pi4} \frac{2cosec^2x \,cotx}{cosec^2 x}\)
\(= \lim\limits_{x\to \frac\pi4 } 2\,cot x \)
\(= 2\,cot\frac\pi4\)
\( = 2\)