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tgα=2sinα
sinα/cosα=2sinα /·coα
sinα=2sinαcosα
sinα-2sinαcosα=0
sinα(1-2cosα)=0
sinα=0 ∨ 1-2sinα=0
α=0° -2cosα=-1
sprzecznosc cosα=¹/₂
α=60°
odp.30°,60°,90°
b)
sinα-cosα=0
sinα=cosα
α=45°
odp 45°,45°,90°