x<span style="font-weight: 400">²</span>+y<span style="font-weight: 400">²</span>+z<span style="font-weight: 400">²</span>=2, xy+yz+zx=1 হলে (x+2y)<span style="font-weight: 400">²</span>+(y+2z)<span style="font-weight: 400">²</span>+(z+2x) এর মান –