Question

lim(1-cosx)/x2 x趋向于0

Answer 1

0/0型求导

limf/g=limf'/g'

lim(1-cosx)/x2 =lim(1-cosx)'/(x^2 )'

=lim(sinx)/2x

=lim(sinx)'/(2x)'

=lim(cosx/2)

=1/2