F`(x)=1-2cosx*sinx=1-sin2x=0 sin2x=1 2x=π/2+2πn⇒x=π/4+πn,n∈z x=π/4∈[0;π/2] y(0)=0+1²=1наим y(π/4)=π/4+1/2≈1,3 y(π/2)=π/2+0=π/2≈1,6 наиб