Question

cos x = raiz de 3/7

Answer 1

$Cos( \alpha )= \sqrt{3/7} \\ \\ \alpha =Cos^{-1}( \sqrt{3/7} ) \\ \\ \alpha =49,11$º



Salu2''¡¡     >:D

Answer 2

cos X = 3/7 = 0,42857  inv cos X = 64º 37´23,4"