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odpowiedź: 3
zad.7
tgα=sinα / cosα
3=sinα / cosα
sinα=3cosα
sin²α+cos²α=1
(3cosα)²+cos²α=1
9cos²α+cos²α=1
10cos²α=1 /:10
cos²α=1/10 /*√
cosα=√1/10
cosα=1 / √10 * √10/√10 = √10 / 10
sinα=3cosα = 3*√10 / 10 = 3√10 / 10
sinα+cosα=
7.
odp. C