Product of numbers, each of which is the difference of two squares
Prove that if p1 = t1^2 - s1^2 and p2 = t2^2 - s2^2 then p1 * p2 = ( t1 * t2 - s1 * s2)^2 - (t1 * s2 - s1 * t2)^2 and p1 * p2 = ( t1 * t2 + s1 * s2)^2 - (t1 * s2 + s1 * t2)^2 Sign in to see full entry.