(m+n)² - (m-n)² = ??
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Answer:
(m+n)²+(m-n)²=
=(m²+n²+2mn) +(m²+n²-2mn)
=m²+n²+m²+n²+2mn-2mn
=2m²+2n² ans.
or=2(m²+n²) ans.
Step-by-step explanation:
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