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Question Number 207498 by hardmath last updated on 17/May/24

$$\cos 2\mathbf{x}+\sin \mathbf{x}=\mathrm{tg}\left(225°\right)\cdot (0,360°)$$$$\mathrm{sum}\mathrm{of}\mathrm{roots}=?$$

Answered by MM42 last updated on 17/May/24

$$-2{sin}^{2}x+sinx=0$$$$sinx=0\Rightarrow x=\pi$$$$sinx=\frac{1}{2}\Rightarrow x=\frac{\pi }{2}$$$$\Rightarrow s=\frac{3\pi }{2}✓$$$$$$

Commented by hardmath last updated on 17/May/24

$$\mathrm{thank}\mathrm{you}\mathrm{professor}$$

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