3. Find the sum III

1. Add: \((2p^2q^2–3pq+4,5+7pq–3p^2q^2)\)
 
2. Add: \((l^2+m^2,m^2+n^2,n^2+l^2,2lm+2mn+2nl)\)
Answer variants:
\(2l^2+2m^2+2n^2+2lm+2mn+2nl\)
\(p^2q^2+4pq+9\)
\(-p^2q^2+4pq+9\)
\(l^2+m^2+n^2+2lm+2mn+2nl\)
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