tolong bantu jawabkan mtk 28 dan 29

Mapel : Matematika
Kelas : XI SMA
Bab : Trigonometri

Pembahasan :
28|| Opsi D.

Bentuk Umum y = a Sin (x + 90) + c
Nilai Minimum = -|a| + c
Nilai Minimum = -|3| + 4
Nilai Minimum = 1

29|| Opsi C.

BC = 5 cm

Aturan Sinus
a/Sin A = b/Sin B
5/Sin 45 = b/Sin 60
5/(1/2√2) = b/(1/2√3)
5/2√3 = 1/2√2 b
b = (5√6)/2
AC = 5/2 √6