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Áîu=tg(x/2),x=2*Arctgu ,
dx=2*du/(1+u^2),
Sinx=2*tg(x/2)*Cos^2(x/2)=2*u/(1+u^2),
Cosx=1-2*Sin^2(x/2)=1-2*tg^2(x/2)*Cos^2(x/2)=(1-u^2)/(1+u^2)
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