Question

求导数 y=e^-{cos(1/x)}^2

Answer 1

y '=e^[-cos(1/x)]²·{[-cos(1/x)]²} '

=e^[-cos(1/x)]²·2[-cos(1/x)]·[-cos(1/x)] '

=e^[-cos(1/x)]²·2[-cos(1/x)]·sin(1/x)·(1/x) '

=e^[-cos(1/x)]²·2[-co...