sin a= √1-cos(квадрад)а
соs(kvadrad)a =16/25
1-16/25=9/25
sin a= 3/5
2sin a = 6/5
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sin a= √1-cos(квадрад)а
соs(kvadrad)a =16/25
1-16/25=9/25
sin a= 3/5
2sin a = 6/5