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     EduGorilla 
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    If α + β + γ = 2 π

    Options :-

    1. tan a/2 + tan b/2 + tan g/2 = tan a/2  tan b/2  tan g/2
    2. tan a/2 + tan b/2 + tan g/ = -  tan a/2  tan b/2  tan g/2
    3. tan a/2  tan b/2 +  tan b/2 tan g/2 + tan g/2 tan a/2  = 1
    4. tan α  tanβ + tanβ tan γ +  tan γ tan α = 1
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