y=1-z z=1-y
z→1 y→0
lim(y→0)y*tg(п/2-Пy/2)=lim(y→0)y*ctg(п/2y)=
=lim(y→0)(yП/2)*2/П*cos(Пy/2)/sin(Пy/2)=
=lim(y→0)2/П*cos(Пy/2)=2/П
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y=1-z z=1-y
z→1 y→0
lim(y→0)y*tg(п/2-Пy/2)=lim(y→0)y*ctg(п/2y)=
=lim(y→0)(yП/2)*2/П*cos(Пy/2)/sin(Пy/2)=
=lim(y→0)2/П*cos(Пy/2)=2/П