a^2+b^2/4 +c^2/9 + ab +bc/3 +2/3ca
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Step-by-step explanation:
Given, a²+b²/4+c²/9+ab+bc/3+2/3ca
= a²+(b/2)²+(c/3)²+2×b/2×c/3+2×a×c/3
= (a+b/2+c/3)²
= (a+b/2+c/3) (a+b/2+c/3)
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