tan 86° = cot (90° – 86°) = cot 4°.tan 47° = cot (90° – 47°) = cot 43°7there4; (tan 4°. tan 86°) (tan 43°.tan 47°)= (tan 4° : cot 4°) (tan 43°.cot 43°)= 1 (∵ tanθ . cotθ = 1)
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