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cos α = 0,8
sin²α + cos²α = 1 ---> sin²α = 1 - cos²α = 1 - 0,8² = 1 - 0,64 = 0,36
sin α = √0,36 = 0,6
tg α = sin α : cos α = 6/10 : 8/10 = 6/10 * 10/8 = 6/8 = 3/4
ctg α = 1/ tg α = 4/3
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