cot x+ tan x/cot y + tan x = cot x tan y
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cotx =cosx/sinx
tanx = sin / cosx
coty= cosy/siny
cosx/sinx +sinx/cosx ×cosy/siny + cosx/sinx
= cotx tany
tanx = sin / cosx
coty= cosy/siny
cosx/sinx +sinx/cosx ×cosy/siny + cosx/sinx
= cotx tany
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