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1. (m+10-(n-12))*(m+10+(n-12)) (m+10-n+12)*(m+10+n-12) (m+22-n)*(m-2+n) 2. (c+19d-(19c+d))*(c+19d+(19c+d)) (c+19d-19c-d)*(c+19d+19c+d) (-18(c-d))*20(c+d) -18*20(c-d)*(c+d) -360(c-d)*(c+d) 3.