Prove that , where…

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

Problem

Prove that tan⁡2θ=2tan⁡θ1−tan⁡2θ\displaystyle \tan 2\theta = \dfrac{2\tan\theta}{1-\tan^2\theta}, where tan⁡θ≠±1\tan\theta \neq \pm 1.

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