Here's the question you clicked on:
veni
f(x)=cos(4/x); what is the domain of x; identify any asymptotes; find the greatest zero for f(x) & express the answer in exact form
the only asymptote is at x=0, the domain is all the real numbers but 0 i don't understand what do you mean by greatest zero,
Shouldn't there be a horizontal asymptote?