Respostas

2014-06-30T01:17:45-03:00
A)cos(x)=0
x=90 ou π/2
b)cosec(x)=1,  é igual a
1/sen(x)=1
x=0
c)cos²(x)=1-sen²(x)

d) tg²x-3=0
tg²x=3
tgx=+√3
1 3 1