ôîðìóëû, âûðàæàþùèå òðèãîíîìåòðè÷åñêèå ôóíêöèèïåðåìåííîãî x ÷åðåç ïîêàçàòåëüíóþ ôóíêöèþ:Óñòàíîâëåíû Ëåîíàðäîì Ýéëåðîì.
