Problemas con triángulos rectángulos especiales 45-45-90

Now Playing:Triangulos rectangulos especiales 45 45 90 – Example 1a

Si $\, \theta = 45^\circ$ , encuentra el valor exacto de las siguientes expresiones:
1. $3 \, sen^2 \theta$
2. $\tan (3 \theta - 75^\circ)$
3. $\cos^2(120^\circ - 2 \theta)$

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