Prove that for every real for which is defined, 2x = 2 x 1- ^ 2 x .

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

Problem

Prove that for every real xx for which tan⁡x\tan x is defined, tan⁡2x=2tan⁡x1−tan⁡2x.\tan 2x = \frac{2\tan x}{1-\tan^{2}x}.

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