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Question Number 176086 by amin96 last updated on 11/Sep/22

Commented by mahdipoor last updated on 11/Sep/22

$$?=\frac{1}{2cosa}\approx 1.4142$$$$a={tan}^{-1}\left(\frac{sin\frac{720}{7}+sin\frac{360}{7}-4sin\left(\frac{90}{7}\right)sin\left(\frac{900}{7}\right)}{cos\frac{360}{7}+cos\frac{720}{7}}\right)$$$$$$

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