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Cot x + Cot Y = 20 ⇔ 1 + 1 = 20
Tanx tany
⇔ Tanx + Tany = 20
TanxTany
⇔ 15 = 20
TanxTany
⇔ TanxTany = 15/20 = 3/4
Tan(x + y) = Tanx + Tany
1 - TanxTany
= 20
1-3/4
= 20/(1/4)
= 80