I found an equation in a Journal article and I'm trying to write it into a spreadsheet. The problem is 1) I'm not sure what the tand functional actually is and 2) Excel doesn't seem to have it as a built in function. One of hte footnotes told me it was a Tangent Delta function, but Google isn't being too helpful in finding out what that means. Can anyone point me towards a resource that explains it? Based on the explanation I'm hoping I can figure out a way to calculate it in Excel. If someone can tell me if it's hidden in Excel somewhere that would also be very helpful.
Generalized a bit, the formula is R = k*tand(C)
Thanks in advance.
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