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Question Number 187871 by mustafazaheen last updated on 23/Feb/23

$$howissolution$$$$\mathrm{sgn}\left(\cos \frac{21}{10}\right)=?$$

Answered by mr W last updated on 23/Feb/23

$$\frac{21}{10}=2.1>\frac{\pi }{2}but<\pi$$$$\Rightarrow \cos \frac{21}{10}<0$$$$\Rightarrow sgn\left(\cos \frac{21}{10}\right)=-1$$

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