Photos 1 AND M 2 ARE

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1 and m 2 are. N^2-M^2/M^2+2mn+n^2. M2+n2-2mn. M2+n2. M+N-4mn/m+n.
N^2-M^2/M^2+2mn+n^2. M2+n2-2mn. M2+n2. M+N-4mn/m+n.

See also