Respostas

2013-11-25T16:07:10-02:00
4 = sen a / cos a
sen a = 4.cos a
4.cos² a + cos² a = 1
5.cos² a = 1
cos² a = 1/5
cos a = V1/5
4 = sen a / V1/5
sen a = 4.V1/5
y = 4.V1/5 + V1/5
y = 5.V1/5
1 4 1