Tgx≥-1
-π/4+πk≤x<π/2+πk
3)x+y=π/2
sinx+siny=-√2
sin(π/2-y)+siny=-√2
cosy+siny=-√2
1/√2* cosy+1/√2*siny=-1
sinπ/4=1/√2;cosπ/4=1/√2
sin(π/4+y)=-1
π/4+y=-π/2+πk
y=-π/4-π/2+πk
y=-3π/4+πk;k€Z
x=π/2-y==5π/4-πk
1) (-1-4)(1+4+16)= -5*21= -105
2) 2*(-1)+7-(-1+1)(1+1+1)= -2+7-0*3=5
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1. KNM и KLM
2. GNM и MLD
3. HNK и KLC