Question

1)cosx>Корень из 2/2
2)tg5x>1

Answer 1

1)cosx>√ 2/2
-π/4+2πn<x<π/4+2πn

2)tg5x>1

π/4+πn<5x<π/2+πn          π/20+πn/5< x <π/10+πn/5