Question

gente me ajudem
Qual o valor de cos β?

3/5
4/5
5/4
5/3
3/4

Answer 1

$\large\boxed{\begin{array}{l}\rm cos(\beta)=\dfrac{9\div3}{15\div3}\\\huge\boxed{\boxed{\boxed{\boxed{\rm cos(\beta)=\dfrac{3}{5}}}}}\end{array}}$