In Exercises 11-51

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

Problem

In Exercises 11-51, prove the identity. 15. (1−cos⁡u)(1+cos⁡u)cos⁡2u=tan⁡2u\frac{(1-\cos u)(1+\cos u)}{\cos ^{2} u}=\tan ^{2} u

Related theory

Browse the problem library