Kąt alfa jest ostry i jego tg=3 Oblicz sin alfa i cos alfa !

tgα=3 sinα=? cosα=? --------------------------------------------- tgα=sinα/cosα=3 ----------------------------------------------- sinα=3cosα sin²α+cos²α=1 ------------------------------------------ (3cosα)²+cos²α=1 9cos²α+cos²α=1 10cos²α=1 cos²α=0,1 cosα=√0,1=0,3162 sinα=3cosα=3*0,3162=0,9486