sin^2+cos^2=1
cos^2=1 - (√2/3) ^2
cos^2=1 - (2/9)
cos^2=7/9
cos=√7/3
tg=sin/cos
tg = √2/3/√7/3
tg=√ (2/7)
ctg=1/tg=√ (7/2)
Пошаговое объяснение:
