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Q : 3 Add the following.

(iv) $l^2+m^2+n^2 , n^2+l^2, 2lm+2mn+2nl$

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$\\l^{2}+m^{2}+n^{2}+n^{2}+l^{2}+2lm+2mn+2nl\\ =2l^{2}+m^{2}+2n^{2}+2lm+2mn+2nl$

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