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cos=8/10
tg=6/8
ctg=8/6
cos²α=1-sin²α
cosα=√1-0,36
cosα=√0,64
cosα=0,8
tgα=sinα/cosα
tgα=0,6:0,8
tgα=0,75
ctgα=1/tgα
ctgα=4/3