12. सत्यापित कीजिए: x + y + z---
3xyz (x + y + 2) [(x - y) + (y - z) + (z -- x)]
13. यदि x +y+2-0 हो, तो दिखाइए कि x + y +2-3xyz है।
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Answer:
Explanation:
हम जानते है कि x3 + y3 + z3 - 3xyz = ( x + y + z ) ( x2 + y2 + z2 - xy - yz - zx ) = ( 0 ) ( x2 + y2 + z2 - xy - yz - zx ) [ ∵ x + y + z = 0 ]
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