(u+19v)²−(19u+v)² = (u+19v -19u-v) * (u+19v +19u+v) =
= ( -18u+ 18v ) * (20u+ 20v )
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(u+19v)²−(19u+v)² = (u+19v -19u-v) * (u+19v +19u+v) =
= ( -18u+ 18v ) * (20u+ 20v )