Question

Using L'Hopitals Rule evaluate the limit of
Lim x-->0
(cos7x)-1/x^2

I will post my attempts inside

Answer 1

\[\lim_{x \rightarrow 0} \frac{ Cos7x -1 }{ x^2 }\] is \[\frac{ -49 }{ 2 }\]

Answer 2

yes

Answer 3

thank you