0●x=0 {√x–√2/x–2
0●(ab)²
0●2π/3+2πk; 4π/3+2πê |cos<0|
0●2πn<x<n+2πn |sin>0|
0●x=–π/4+πn |sinx+cosx=0|
0●x=π/4+πn |sinx–cosx=0|
0●πk/2 |sinxcosx=0|
0●x=n |sinπx=0|
0●(0; π) |y(x)=sinx+x|
0●2πn,n*Z |logcosx=0|