OB=√3²+1²=√10
OA=√4²+2²=√20
AB=√(√20)²-(√10)²=√20-10=√10
ctg(AOB)=OB/AB=√10/√10=1
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OB=√3²+1²=√10
OA=√4²+2²=√20
AB=√(√20)²-(√10)²=√20-10=√10
ctg(AOB)=OB/AB=√10/√10=1