Calculate focal length from FOV on cameras

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Hi guys!

I've been trying to solve a math problem in excel but I guess I've forgotten math a lot over the years.

I've got the formula:

A = 2*DEGREES(ATAN(43,3/(2*X)))

where A is the Field of View angle of a 35mm camera with focal length X. I need to covert the formula to do the opposite and calculate X with known A. But I cannot use Goal Seek as I need this as a formula. Can anyone help me to convert the formula?

Thanks!
 

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