у¹= 12х¹¹+cosx
y¹=2x sinx+x²cosx=x(2sinx+x cosx)
!!!!!!!!!!!!!!!!!!!!!!!!!!
<span>1-cosx=2*sin(x\2) </span><span>2sin²(x/2)-2sin(x/2)=0 </span><span>sin(x/2)(sin(x/2)-1)=0 </span><span>a) sin(x/2)=0 </span><span>x/2=πn </span><span>x1=2πn </span><span>б) </span><span>sin(x/2)-1=0 </span><span>sin(x/2)=1 </span><span>x/2=π/2+2πn </span><span>x2=πn+4πn</span>