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Sagot :
Answer:
The answer already exists in your question...
That is correct expansion
Answer:
Step-by-step explanation:
(p+q)^2 = (p+q)*(p+q) = (p+q)*p + (p+q)*q = p^2 + pq + pq + q^2 = p^2 + 2pq + q^2
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