Question

1 - Considere o ângulo x€(π; 3π/2) Sabendo que cos (x) =0,6, determine o valor de Sen (x)​

Answer 1

$\large\boxed{\begin{array}{l}\sf cos(x)=0,6\implies cos^2(x)=0,36\\\sf sen^2(x)=1-0,36=0,64\\\sf sen(x)=-\sqrt{0,64}\\\sf sen(x)=-0,8\end{array}}$