Problem of trigonometry

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As I understand it, you are given that B (a vertex) and G (the center) of the square lie on the circle, and you want to find 2 times the tangent of the marked angle. (I can't translate "mallar" without knowing the language!)

What have you tried? Do you want to use coordinate geometry, or trigonometry directly, or what?
 
I want to use trigonometry, and what the problem asks is correct, find 2 times the tangent of the angle theta
 
Nabucodonosor said:
I want to use trigonometry, and what the problem asks is correct, find 2 times the tangent of the angle theta
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Again, please show what you have tried, so we can help you continue.

You might start by calling the side of the square 1, or perhaps the radius instead. You might also draw in some extra segments, such as radii.
 
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