8 tan x + 2 tan y 1 - tan x tan y = 11 = 1 2 cot y 1 cot y 8 cot y + 2 cot (x) 8 cot x + 1 cot x cot x. cot y cot x. coty -| cot x cot y 2 cotx + 8 cot y cot x cot y - 1 X

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