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Simplify cos⁡5xcos⁡2x+sin⁡5xsin⁡2x\cos 5 x \cos 2 x+\sin 5 x \sin 2 x

Question 37

Short Answer

Simplify cos⁡5xcos⁡2x+sin⁡5xsin⁡2x\cos 5 x \cos 2 x+\sin 5 x \sin 2 x .

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