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    Law of Tangents

    Equation

    (a - b)/(a + b) = tan((α - β)/2)/tan((α + β)/2) | 
b | second side length
a | first side length
α | angle opposite first side
β | angle opposite second side

    Input values

    first side length | 1
angle opposite first side | 60° (degrees)
angle opposite second side | 60° (degrees)

    Result

    second side length | 1

    Diagram

    Diagram

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