Question

Quanto é o Sen(-30°)? ​

Answer 1

$\Large\boxed{\begin{array}{l}\rm A\,func_{\!\!,}\tilde ao\,seno\,\acute e\,\acute impar\\\sf sen(-x)=-sen(x).\\\sf sen(-30^\circ)=-sen(30^\circ)=-\dfrac{1}{2}\end{array}}$