If $\tan x+\tan y=4$ and $\cot x+\cot y=5$, compute $\tan (x+y)$.
Question:
If $\tan x+\tan y=4$ and $\cot x+\cot y=5$, compute $\tan (x+y)$.
Answer:
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If $\tan x+\tan y=4$ and $\cot x+\cot y=5$, compute $\tan (x+y)$.
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