Prove that + 2 2 + 4 4 + 8 8 =

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

Prove that tan⁡α+2tan⁡2α+4tan⁡4α+8cot⁡8α=cot⁡α\tan \alpha + 2 \tan 2\alpha + 4 \tan 4\alpha + 8 \cot 8\alpha = \cot \alpha

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