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sin²α+cos²α=1
(¹/₂)²+cos²α=1
cos²α=1-¹/₄=³/₄
cosα=√(³/₄)=³/₂
tgα=sinα/cosα=¹/₂:³/₂=¹/₃
ctgα=1/tgα=1:¹/₃=3