[tex]sen(\frac{\pi}{2}) = 1 ,\ cos (\pi) = -1\\ \\sen(\frac{\pi}{2})=cos (\pi)\ Es\ Falso\\ ---------------\\ \\tg(2\pi)=0,\ sen(\pi)=0\\ \\tg(2\pi)=sen(\pi)\ Es\ Verdadero\\ ---------------\\ \\cos(\frac{\pi}{2})=0,\ sen(\frac{3\pi}{2})=-1\\ \\cos(\frac{\pi}{2})=sen(\frac{3\pi}{2})\ Es\ Falso[/tex]
