Lommeregnere

Hjælp til Texas TI-83
http://education.ti.com/educationportal/sites/US/productDetail/us_ti83p.html
http://www.prenhall.com/divisions/esm/app/graphing/ti83

Hjælp til Texas TI-84 plus
https://education.ti.com/en/guidebook/details/en/3BBF042421644CE2AF713484B03A8B11/ti-84-plus-ce
https://www.varsitytutors.com/hotmath/graphing_calculators/ti84_movie_index.html (Flash movies)