Respuesta :

LammettHash
[tex]\cos B=\dfrac{6.3}{9.8}\implies B=\cos^{-1}\dfrac{6.3}{9.8}[/tex]
[tex]\sin B=\dfrac{7.5}{9.8}\implies B=\sin^{-1}\dfrac{7.5}{9.8}[/tex]

These are the only two correct choices.