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[tg(a)+1]:[2tg(a)-1]=(5/4+1):(5/2-1)=9/4:3/2=3/2=1,5. [2ctg(a)-1]:[2+ctg(a)]=(-1-1):(2-1/2)=-2:(3/2)=-4/3.
Tue, 23 Feb 2016 12:04:46 +0300
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