< a href =" http : / / www . math . snu . ac . kr / taoffice / calculus / syllabi / 2020 / first - semester / L 0442 . 000100 - frame . html " target ="_ blank "> http : / / www . math . snu . ac . kr / taoffice / calculus / syllabi / 2020 / first - semester / L 0442 . 000100 - frame . html </ a >