(sin 15° cos 15°) (sin 15° -cos 15°) matriks berordo 1x2 dan 2x1 tentukan hasil perkaliannya.. tolong bantu

MaTriks

[sin 15 cos 15] [sin 15 -cos 15]

Anggap tersusun 1 × 2 dan 2 × 1
Hasilnya 1 × 1

= [(sin 15 sin 15 + (- cos 15 cos 15))]
= [-(cos² 15 - sin² 15)]
= [-cos (2.15)]
= [-cos 30°]
= [-1/2 √3]