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Question

Add the following:
l2+m2,m2+n2,n2+l2 and 2lm+2mn+2nl

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Solution

Sum = l2+m2+m2+n2+l2+n2+2ml+2mn+2nl (adding like terms)

Hence, the sum is
2(l2+m2+n2+lm+mn+nl)

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