Which of the following is true or false? a)An orthogonal and symmetric matrix Q satisfies Q2=I b)cos(2x) and sin(2x) are the orthonormal vectors in C[−π/2,π/2] with the standard inner product. c)If the columns of nxn matrix U are orthonormal set of vectors then U is an orthogonal matrix.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.1: Inner Product Spaces
Problem 10AEXP
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Which of the following is true or false?

a)An orthogonal and symmetric matrix Q satisfies Q2=I

b)cos(2x) and sin(2x) are the orthonormal vectors in C[−π/2,π/2] with the standard inner product.

c)If the columns of nxn matrix U are orthonormal set of vectors then U is an orthogonal matrix.

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