а) 10π+π/2<α<11π+π/2 π/2<α<π+π/2 π/2<α<3π/2
b) -20π-π/2<α<-20π+π/2 -π/2<α<+π/2
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а) 10π+π/2<α<11π+π/2 π/2<α<π+π/2 π/2<α<3π/2
b) -20π-π/2<α<-20π+π/2 -π/2<α<+π/2