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[" If the straight lines "ax+by+c=0,bx+c...

[" If the straight lines "ax+by+c=0,bx+cy+a=0,cx+ay+b=0" are concurrent then prove "],[" that "a^(3)+b^(3)+c^(3)=3abc],[" If the acute angle betwean the "]

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If the straight lines ax+by+c=0, bx+cy+a=0 and cx+ay+b=0 are concurrent, then prove that a^(3)+b^(3)+c^(3)=3abc

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