evaluate tanA+2tan2A+4tan4A+8cot8A=?...

evaluate `tanA+2tan2A+4tan4A+8cot8A=?`

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Prove that : tan A + 2tan2A + 4 tan4A + 8cot8A =cotA

Prove that tan A+2tan2A+4tan4A+8cot8A=cot A

Prove the following: tanA+2tan2A+4tan4A+8cot8A=cotA

tan A+2tan2A+4tan4A+8cot8A=k cot A then find the value of k.

Find the absolute value of (tanAtan2A)+(tan2A tan4A)+(tan4A tanA) where A=(2pi)/7 .

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