Jika A = (1 -2 3 0) maka A² – A = 17/01/2023 by rizalhadizan Pembahasan: A = ⎛1 -2⎞ ⎝3 0⎠ A² – A = ⎛1 -2⎞ ⎛1 -2⎞ _ ⎛1 -2⎞ = ⎝3 0⎠ ⎝3 0⎠ ⎝3 0⎠ ⎛-5 -2⎞ _ ⎛1 -2⎞ ⎝3 -6⎠ ⎝3 0⎠ = ⎛-6 0⎞ ⎝0 6⎠ Nilai sin 110° + sin 80° + sin 50°/cos 290° – cos 130° + 3 sin 80°