cos(2x+pi/4)=0

sin(x+3pi/4)=0

1. 2x+п/4=п/2+Пk2x=п/4+Пkx=п/8+Пk/22.sin(x+П/2+п/4)=0cos(x+п/4)=0x=П/4+Пkk∈Z

cos(2x+π/4)=0;cos(π/2)=0;2x+π/4=π/2;2x=π/2-π/4;2x=π/4;x=π/8.sin(x+3π/4)=0;sin(0)=0;x+3π/4=0;x=-3π/4.