1.sin(x)+sqrt(2)=0
sin(x)=-sqrt(2)
x=(-1)^n*arcsin(-sqrt(2))+pi*n
2.cos(x/2+pi/4)+1=0
cos(x/2+pi/4)=-1
x/2+pi/4=pi+2*pi*n
x/2=pi-pi/4+2*pi*n
x/2=3pi/4 +2*pi*n
x=6*pi/4 +4*pi*n
x=3*pi/2 +4*pi*n
1.sin(x)+sqrt(2)=0
sin(x)=-sqrt(2)
x=(-1)^n*arcsin(-sqrt(2))+pi*n
2.cos(x/2+pi/4)+1=0
cos(x/2+pi/4)=-1
x/2+pi/4=pi+2*pi*n
x/2=pi-pi/4+2*pi*n
x/2=3pi/4 +2*pi*n
x=6*pi/4 +4*pi*n
x=3*pi/2 +4*pi*n