In Exercises 11-51

MATHEMATICS · Subjective · GCSE · Further Mathematics · Geometry and Trigonometry · Geometry and Trigonometry

Problem

In Exercises 11-51, prove the identity. 49. cos⁡3x=(1−sin⁡2x)(cos⁡x)\cos ^{3} x=\left(1-\sin ^{2} x\right)(\cos x)

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