Mathematics

Mathematics

Problem

62. Writing to Learn Explain why 1−cos⁡2x2=∣sin⁡x∣\sqrt{\frac{1-\cos 2 x}{2}}=|\sin x| is an identity but 1−cos⁡2x2=sin⁡x\sqrt{\frac{1-\cos 2 x}{2}}=\sin x is not an identity.

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