решить неравенство sin^2x+2sinx>0
1/2 (4 sin(x)-cos(2 x)+1)>0
sin(x/2) (sin(x)+2) cos(x/2)>0
sin(x)>0
2pi n<x<2pi n+pi, n=Z
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1/2 (4 sin(x)-cos(2 x)+1)>0
sin(x/2) (sin(x)+2) cos(x/2)>0
sin(x)>0
2pi n<x<2pi n+pi, n=Z