Mathematics, 06.08.2019 23:20, alma79

Find the value of $\cos\left(\dfrac{\pi}{9}\right)+\co s\left(\dfrac{3\pi}{9}\right)+\cos\ left(\dfrac{5\pi}{9}\right)+\cos\le ft(\dfrac{7\pi}{9}\right)$
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Mathematics, 11.08.2019 17:10, flixtier

Hey! sum was solved. now try it with multiply! find the value of [tex] \cos\left(\dfrac{\pi}{9}\right)\cdot \cos\left(\dfrac{3\pi}{9}\right)\cdot \cos\left(\dfrac{5\pi}{9}\right)\cdot \cos\left(\dfrac{7\pi}{9}\right)\cdot [/tex]

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Find the value of $\cos\left(\dfrac{\pi}{9}\right)+\co s\left(\dfrac{3\pi}{9}\right)+\cos\ left(\dfrac{5\pi}{9}\right)+\cos\le ft(\dfrac{7\pi}{9}\right)$
show your work! : )