Think Diagonal Use the ideas of Problem to evaluate the determinants in Problem.ProblemTri...

Think Diagonal Use the ideas of Problem to evaluate the determinants in Problem.

Problem

Triangular Determinants Show that the determinant of an upper triangular matrix is the product of its diagonal elements. The diagonal matrix is a special case. The statement for a lower triangular matrix can be proved in a similar fashion. HINT: For each cofactor expansion, use the first column.