Let A = Q1R1 = Q2R2, where Q1 and Q2 are orthogonal and R1 and R2 are

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Let A = Q1R1 = Q2R2, where Q1 and Q2 are orthogonal and R1 and R2 are both upper triangular and nonsingular.
(a) Show that QT1Q2 is diagonal.
(b) How do R1 and R2 compare? Explain.
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