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Answer : 2 0 Explanation : Answer: B) 0 Explanation: = log tan10 log tan890   log tan20  log tan880 ⋯⋯ log tan450   = log [tan10 × tan890]   log [tan20 × tan880 ]  ⋯⋯ log1   ∵ tan(90-θ)=cotθ and tan 450=1   = log 1 log 1 ..... log 1  = 0.

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