Razones trigonométricas de ángulos en radianes

Now Playing:Razones trigonometricas de angulos en radianes – Example 1a

Encuentra los valores:
1. sen $\large {\pi \over 3}$
2. cos $\large {{3 \pi} \over 4}$
3. tan $\large{{7 \pi} \over 6}$

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