Resposta:
[tex]a) \sin( \alpha ) = \dfrac{cateto \: oposto}{hipotenusa} \\ \\ \sin( \alpha ) = \dfrac{8}{13} \\ \\ \blue{ \sin( \alpha ) = 0,6154}[/tex]
[tex]b) \: \cos( \alpha ) = \dfrac{cateto \: adjacente}{hipotenusa} \\ \\ \cos( \alpha ) = \dfrac{6}{13} \\ \\ \blue{ \cos( \alpha ) = 0,4615}[/tex]
[tex]c) \sin( \beta ) = \dfrac{6}{13} \\ \\ \blue{ \sin( \beta ) = 0,4615}[/tex]
[tex] d)\cos( \beta ) = \dfrac{8}{13} \\ \\ \blue{ \cos( \beta ) = 0,6154}[/tex]
Bons Estudos!
