In Exercises 11-51

MATHEMATICS · Subjective · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

In Exercises 11-51, prove the identity. 17. cos⁡2x−1cos⁡x=−tan⁡xsin⁡x\frac{\cos ^{2} x-1}{\cos x}=-\tan x \sin x

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