Question

sabendo que senX= 1/3 com π/2 < x < π , determine o valor de=
a) cosX
b) tgX

Answer 1

2 2
Letra a = 1 + Cósx = 1
3

2
1 + Cosx = 1
9


2
Cosx = 8
9
Cosx = raiz de 8
9
Cosx = 2 raiz de 2
3