class ix algebra chapter-2 expansion part-4 | (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca

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class ix algebra chapter-2 expansion part-4 | (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca

class ix algebra chapter-2 expansion part-4 | (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca