# How do I define a sine wave?

Dear All,

I have an apparatus that produces a graph of results that looks to me like a sine wave (a half wave plate affecting the power throughput of a laser; it goes from maximum to minimum 4x throughout its 360º rotation). My problem is that I need to define this line as a formula but have no idea where to start. Any ideas, anyone?

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quasar987
$$y(x) = Asin \left(\frac{2\pi (x-d)}{T}\right)$$