how does (a+b+c)^2=a^2+b^2+c^2+2ab+3bc+2ca. comes??
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(a+b+c)^2=(a+b+c)(a+b+c)
=a^2+ab+ca+ab+b^2+bc+ca+ab+c^2
=a^2+b^2+c^2+2ab+2bc+2ca
it is your answer
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=a^2+ab+ca+ab+b^2+bc+ca+ab+c^2
=a^2+b^2+c^2+2ab+2bc+2ca
it is your answer
.............
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