A certain experiment produces the data (3,7.6), (4,5.6), and (5,-0.5). Describe the model that produces a least-squares fit of

Question

A certain experiment produces the data (3,7.6), (4,5.6), and (5,-0.5). Describe the model that produces a least-squares fit of these points by a function of the form
y= A cos x + B sin x.

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