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Jawaban:
B
Penjelasan dengan langkah-langkah:
|a| = 4
|b| = 3
ß = 2π/3 = 120°
ā(ā + b) = ā×ā× cos 0° + ā×b× cos 120°
= 4² × 1 + 4×3 × (–½)
= 16 × 1 – 12/2
= 16 – 6
= 10