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Question Number 85623 by jagoll last updated on 23/Mar/20

$$\mathrm{prove}\mathrm{that}$$$$\sin \mathrm{x}\cos 2\mathrm{x}=\frac{1}{4\sin 4\mathrm{x}\sec \mathrm{x}}$$

Answered by Henri Boucatchou last updated on 23/Mar/20

$$WrongSir;$$$$Takex=\frac{\pi }{4},0\ne \frac{1}{0}$$

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