Question

Can someone help me with this?

Answer 1

Question in attachment.

Answer 2

the limit is 0

Answer 3

\[\lim_{x \rightarrow 0}\frac{cosx-1}{x}=0\]

Answer 4

\[\lim_{x \rightarrow 0}\frac{cosx-1}{2x}=\frac{1}{2}\lim_{x \rightarrow 0}\frac{cosx-1}{x}=\frac{1}{2}*0=0\]

Answer 5

thanks!!