Oblicz tgL wiedząc ze sinL= dwie siódme.
sin^2 + cos^2 = 1
(2/7)^2 + cos^2=1
4/49 + cos^2=1
cos^2=1- 4/49
cos^2= 45/49
cos= sqrt(45)/49 LUB (u) cos= - sqrt(45)/49
tg= (2/7) / sqrt(45)/49 LUB tg=(2/7) / -sqrt(45)/49
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sin^2 + cos^2 = 1
(2/7)^2 + cos^2=1
4/49 + cos^2=1
cos^2=1- 4/49
cos^2= 45/49
cos= sqrt(45)/49 LUB (u) cos= - sqrt(45)/49
tg= (2/7) / sqrt(45)/49 LUB tg=(2/7) / -sqrt(45)/49