Resolviendo ecuaciones trigonométricas de segundo grado

Now Playing:Es solve second degree trigonometric equations – Example 1a

Resuelve las siguientes ecuaciones trigonométricas:
1. $6 \, sen^2x + 3 \, sen \, x = 0$
  Para $0 \leq x \leq 2\pi$
2. $2\cos^2 x + 3 \cos x + 1 = 0$
  Solución general en radianes
3. $3 \, sen^2 x - 8 \, sen \, x = -4$
  Solución general en grados

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