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np. dla tg43⁰ x tg47⁰
tg47⁰=tg(90⁰-43⁰)= ctg43⁰
tg43⁰xctg43⁰ = 1
rozwiązania w załączniku
tg 4/18π x tg 5/18π x tg 6/18π
4/18π=4/18*180⁰=40⁰
5/18π=5/18*180⁰=50⁰
6/18π=6/18*180⁰=60⁰
tg 4/18π x tg 5/18π x tg 6/18π=tg40⁰ * tg50⁰ *tg60⁰=
tg40⁰ * ctg40⁰ *√3=1*√3=√3
wzór: tgα=ctg(90⁰-α)