Question: How do I curve fit data to this form?

I'm trying to figure out how to fit the data below to a curve of the form: a+b*sin[(pi*x)/6-c] How do can I do this in Maple 10? 1,43.2 2,47.2 3,53.7 4,60.9 5,70.5 6,82.1 7,88.0 8,86.0 9,77.4 10,66.0 11,51.5 12,44.1
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