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Question Number 29834 by abdo imad last updated on 12/Feb/18

$$find\frac{1}{{cos}^4\left(\frac{\pi }{9}\right)}+\frac{1}{{cos}^4\left(\frac{3\pi }{9}\right)}+\frac{1}{{cos}^4\left(\frac{5\pi }{9}\right)}+\frac{1}{{cos}^4\left(\frac{7\pi }{9}\right)}.$$

Commented by MJS last updated on 14/Feb/18

$$=1120\mathrm{but}\mathrm{it}\mathrm{takes}\mathrm{quite}\mathrm{some}$$$$\mathrm{time}\mathrm{to}\mathrm{show}...$$

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