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Prove that: tanA + 2tan2A + 4tan4A + 8cot8A = cotA
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tanA + 2tan2A + 4tan4A + 8cot8A = cotA
'Prove the identity: tanA + 2tan2A + 4tan4A + 8cot8A = cotA'
tanA + 2tan2A + 4tan4A + 8cot8A = cotA
'Prove the identity: tanA + 2tan2A + 4tan4A + 8cot8A = cotA'