Explain, in at most two sentences, why ( 1- ^ 2 ^ 2 =1 ) for any acute angle (…

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

Problem

Explain, in at most two sentences, why 1−sin⁡2θcos⁡2θ=1\dfrac{1-\sin^{2}\theta}{\cos^{2}\theta}=1 for any acute angle θ\theta.

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