Sin(П/4)cosx+cos(П/4)*sinx<-√2/2

Question

Sin(П/4)cosx+cos(П/4)*sinx<-√2/2

Answer 1

Sin(π/4+x)<-√2/2<br>5π/4+2πn<π/4+x<7π/4+2πn<br>5π/4-π/4+2πnπ+2πnx∈(π+2πn;3π/2+2πn)