Resolviendo ecuaciones trigonométricas con múltiples ángulos

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Resuelve las siguientes ecuaciones
i) Determina su solución general
ii) $0 \leq x \leq 2\pi$ $0 \leq x \leq 2 π$
1. $sen \, 3x = - {1 \over 2}$
2. $\cos 2x = {\sqrt2 \over 2}$

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