1.

(a+b)(a-b)+(b+c)(b-c)+(c+a)(c+a)

Answer» <html><body><h2>★<u>A</u><u>n</u><u>s</u><u>w</u><u>e</u><u>r</u>♣</h2><p>0</p><p><strong>Step-by-step <a href="https://interviewquestions.tuteehub.com/tag/explanation-455162" style="font-weight:bold;" target="_blank" title="Click to know more about EXPLANATION">EXPLANATION</a>:</strong></p><h3>★<u>using</u> <u><a href="https://interviewquestions.tuteehub.com/tag/identity-1036134" style="font-weight:bold;" target="_blank" title="Click to know more about IDENTITY">IDENTITY</a></u><u>:</u><u>-</u></h3><p>↦ (a+b)(a-b)=a²-b²</p><p>So, a²-b²+b²-c²+c²-a²</p><p>↦0</p></body></html>


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