Решите неравенство : 1) сos (x/2-pi/4)> 0 2)tg(-2x)> 0

1
-π/2+2πn<x/2-π/4<π/2+2πn,n∈x
-π/4+2πn<x/2<3π/4+2πn,n∈z
-π/2+4πn<x<3π/2+4πn,n∈z
x∈(-π/2+4πn;3π/2+4πn,n∈z)
2
πn<-2x<π/2+πn,n∈z
-π/4+πn<x<πn,n∈z
x∈(-π/4+πn;πn,n∈z)