Question: need help Use the properties det(AB) = det(A) . det(B) and det(1,,) = 1 for n x n matrices to show the following: a. The

need help

Use the properties det(AB) = det(A) . det(B) and det(1,,) = 1 for n x n matrices to show the following: a. The n x n matrices with determinant 1 form a normal subgroup of GL(n, R). b. The n x n matrices with determinant #1 form a normal subgroup of GL(n, R)

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