Tolong dijawab dengan caranya yaa :)))

Tarik garis lurus C ke garis AB, siku2 di D.

sin 30 = depan/miring(CA)
1/2 = CD/8
8*1/2 = CD
4 cm = CD

CB^2 = CD^2 + DB^2
12^2 = 4^2 + DB^2
144 = 16 + DB^2
144 - 16 = DB^2
128 = DB^2
DB = √128 = √64 * √2 = 8√2

tan B = depan/samping
tan B = CD/DB
tan B = 4/(8√2)
= 1/(2√2)
= [1/(2√2)] * √2/√2
=1/4*√2