Ответ:
Объяснение:
5) y>-sgrt(2) при -pi/4+2pik<t<5pi/4+2pik, k∈z
6)3cos^2(a)-6+3sin^2(a)=3((sin^2(a)+cos^2(a))-6=3*1-6=-6
7) (cost-1)/sint*(cost+1)/sint=((cos^2(t)-1))/sin^2(t)=-sin^2(t)/sin^2t=-1
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Ответ:
Объяснение:
5) y>-sgrt(2) при -pi/4+2pik<t<5pi/4+2pik, k∈z
6)3cos^2(a)-6+3sin^2(a)=3((sin^2(a)+cos^2(a))-6=3*1-6=-6
7) (cost-1)/sint*(cost+1)/sint=((cos^2(t)-1))/sin^2(t)=-sin^2(t)/sin^2t=-1