Respostas

2013-12-04T22:02:13-02:00
Cos²x + sen²x = 1
            sen²x = 1 - (1/16)
            senx  = √(15/16)
            sen x = √15/4


tg x = sen x / cos x
tg x = (√15/4) / (-1/4)
tg x = - √15
1 5 1