sciencetalk

http://sciencetalk.nl/forum/index.php/topic/77490-microcursus-goniometrie-sinus-cosinus-tangens-basis/
 
(afb.3) (bron:<a class="bbc_url" href="" title="Externe link">wisfaq</a>)  Link gaat nergens heen. 

dank, is gerepareerd...