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Mathematics 13 Online
OpenStudy (anonymous):

(2a^x+b^x)^2

OpenStudy (unklerhaukus):

\[(n+m)^2=(n+m)(n+m)\\\qquad\qquad=n(n+m)+m(n+m)\\\qquad\qquad= n^2+nm+mn+m^2\\\qquad\qquad=n^2+2nm+m^2\]

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