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Question Number 181756 by Mastermind last updated on 29/Nov/22

$$\mathrm{Without}\mathrm{using}\mathrm{calculator},\mathrm{what}\mathrm{is}\mathrm{the}$$$$\mathrm{value}\mathrm{of}\mathrm{Cos}\left(\frac{7\pi }{6}\right)?$$$$$$$$.$$

Answered by a.lgnaoui last updated on 29/Nov/22

$$\cos \left(\frac{7\pi }{6}\right)=\cos \left(\frac{6\pi +\pi }{6}\right)=-\cos \left(\frac{\pi }{6}\right)=\frac{-\sqrt{3}}{2}$$

Answered by CElcedricjunior last updated on 29/Nov/22

$$\mathit{c}\mathit{o}\mathit{s}\left(\frac{7\mathit{\pi }}{6}\right)=\mathit{c}\mathit{o}\mathit{s}(\mathit{\pi }+\frac{\mathit{\pi }}{6})=-\mathit{c}\mathit{o}\mathit{s}\frac{\mathit{\pi }}{6}=-\frac{\sqrt{3}}{2}$$$$.======================$$$$........lecelebrecedricjunior..........$$$$===================$$

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