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4/8,5=cosα
cosα=0,47
α=62
b) 5/√34=sinα
5/5,83=sinα
sinα=0,85
α=59
c)6/2=tgβ
3=tgβ
β=72
6/10=sinα
0,6=sinα
α=37
d) 2/3=sinα
sinα=0,66
α=42
2/3=cosβ
0,66=cosβ
β=48