1 Answered Questions for the topic proof verification

03/23/19

What is the geometry behind $\\frac{\ an 10^\\circ}{\ an 20^\\circ}=\\frac{\ an 30^\\circ}{\ an 50^\\circ}$?
This identity is solvable by the help of trigonometry identities, but I guess there is an interesting and simple geometry interpretation behind this identity and I can't find it. >I found it... more
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