Question

Решите систему неравенств:
$\left \{ {{tgx>0} \atop {sinx>-1/2}} \right.$

Answer 1

2πn<x<π/2+2πn U π+2πn<x<3π/2+2πn
-π/6+2πn<7π/6+2πn
x∈(2πn;π/2+2πn) U (π+2πn;7π/6+2πn)