The graph of y = cos (x - 1.3) is a sinusoid with a phase displacement of 1.3 radians.
Given that cos 1.3 ≈ 0.27 and sin 1.3 ≈ 0.96, write y as a linear combination of cos x and sin x.
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I'm new to linear equations so I want to make sure I'm doing this correctly...