The trace of a matrix A, designated by tr(A), is the sum of the elements on the main diagonal. The sum of the eigenvalues of a matrix equals the trace of the matrix.
A, C, and D
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On the harpsichord, tones are produced by strings stretched over a soundboard.
<h3>What is the use of the harpsichord?</h3>
On the harpsichord, tones are made by strings that are said to be stretched over in the soundboard, that is known to be a thin piece of wood that increases or amplifies the sound that is given by the strings.
Note that harpsichord keyboard is said to be not touch-sensitive and as such, On the harpsichord, tones are produced by strings stretched over a soundboard.
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A anticyclone and windless conditions
