Respostas

2014-06-06T19:09:53-03:00
Se esse r que vc botou for pi .

pi radiano=180°

2senpi/3 - 5.cos5pi/6
2.sen180/3 - 5.cos.5.180/6
2.sen60 - 5.cos.150
2.√3/2-5.√3/2
√3-5√3/2
(2√3-5√3)/2
-3√3/2
1 5 1