Find Sin Function from points?

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I have these points and I need to find the sine function can anyone please show me how to do this step by step? Or just give me pointers on where to start and what the equation actually is?

(0,2.8) (2.4, 3.3) (6.2, 2.9) (8.6 2.7) (9.9, 2.85)

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The figure below shows the result of fitting with the function $y = a_0+ a_1\sin(\omega x) + a_2\cos(\omega x)$

Of course, this result can be written on the form $y = a_0+ a_3\sin(\omega x + \phi) $

enter image description here