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sinα/cosα=4
sinα=4cosα
sin²α+cos²α=1
(4cosα)²+ cos²α=1
16cos²α+cos²α=1
17cos²α=1 /:17
cos²α=1/17
cosα=√1/√17 i sinα=4*1/√17=4/√17 po usunięciu niewymierności
cosα=1√17/17
sinα=4*√17/17
Odp.A