Bantu jawab kak, materi PERKALIAN DUA SKALAR DUA VEKTOR R2
Penjelasan dengan langkah-langkah:
a x b = (1 x (-4) - 3x2)
a x b = -4 - 6
a x b = - 10
|a| = √(1² + (-4)²) = √17
|b| = √(-3)²+2²) = √13
cos(a, b) = a x b
|a| x |b|
cos(a, b) = –10
√17.√13
cos(a, b) = –10
√221
