#### 51.92
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- \[ \cos^2\left(\frac{\pi}{2} + \phi\right) = \sin^2(\phi) = 0 \]
- \[ \sin(\phi) = 0 \]
- #### 2300
- #### 298.29Question: Find the sum of all angles $ z \in [0^\circ, 360^\circ] $ that satisfy $ 2\sin(2z) + 1 = 0 $.
- $ f(x) = 2\left( rac{1 - \cos 2x}{2}
- + (n-1) \cdot 7 \leq 200 \Rightarrow (n-1) \cdot 7 \leq 197 \Rightarrow n-1 \leq 28.14 \Rightarrow n \leq 29
