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9. Nilai \( \frac{\sin 60^{\circ}-\tan 30^{\circ}}{\cos 45^{\circ}} \) adalah

Ask by George Bowman. in Indonesia
Dec 03,2024

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Answer

Nilai \( \frac{\sin 60^{\circ}-\tan 30^{\circ}}{\cos 45^\circ} \) adalah sekitar 0.408248 atau \( \frac{\sqrt{6}}{6} \).

Solution

Calculate or simplify the expression \( (\sin(60^\circ)-\tan(30^\circ))/\cos(45^\circ) \). Calculate the value by following steps: - step0: Calculate: \(\frac{\left(\sin\left(60^{\circ}\right)-\tan\left(30^{\circ}\right)\right)}{\cos\left(45^{\circ}\right)}\) - step1: Remove the parentheses: \(\frac{\sin\left(60^{\circ}\right)-\tan\left(30^{\circ}\right)}{\cos\left(45^{\circ}\right)}\) - step2: Subtract the terms: \(\frac{\frac{\sqrt{3}}{6}}{\cos\left(45^{\circ}\right)}\) - step3: Multiply by the reciprocal: \(\frac{\sqrt{3}}{6}\times \frac{1}{\cos\left(45^{\circ}\right)}\) - step4: Multiply the terms: \(\frac{\sqrt{3}}{6\cos\left(45^{\circ}\right)}\) - step5: Multiply the terms: \(\frac{\sqrt{3}}{3\sqrt{2}}\) - step6: Multiply by the Conjugate: \(\frac{\sqrt{3}\times \sqrt{2}}{3\sqrt{2}\times \sqrt{2}}\) - step7: Multiply the numbers: \(\frac{\sqrt{6}}{3\sqrt{2}\times \sqrt{2}}\) - step8: Multiply the numbers: \(\frac{\sqrt{6}}{6}\) Nilai \( \frac{\sin 60^{\circ}-\tan 30^{\circ}}{\cos 45^{\circ}} \) adalah sekitar 0.408248 atau \( \frac{\sqrt{6}}{6} \).

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Mari kita hitung nilai tersebut langkah demi langkah. Pertama, kita akan mencari nilai sin dan tan yang diperlukan: - \( \sin 60^{\circ} = \frac{\sqrt{3}}{2} \) - \( \tan 30^{\circ} = \frac{1}{\sqrt{3}} \) - \( \cos 45^{\circ} = \frac{\sqrt{2}}{2} \) Sekarang kita substitusi nilai-nilai tersebut ke dalam rumus: \[ \frac{\sin 60^{\circ} - \tan 30^{\circ}}{\cos 45^{\circ}} = \frac{\frac{\sqrt{3}}{2} - \frac{1}{\sqrt{3}}}{\frac{\sqrt{2}}{2}} \] Lanjutkan dengan menyederhanakan bagian atas: Pertama, cari nilai \( \frac{1}{\sqrt{3}} \) dengan penyamaan penyebut: \[ \frac{1}{\sqrt{3}} = \frac{\sqrt{3}}{3} \] sehingga, \[ \frac{\sqrt{3}}{2} - \frac{1}{\sqrt{3}} = \frac{\sqrt{3}}{2} - \frac{\sqrt{3}}{3} \] Mencari penyebut yang sama, yaitu 6: \[ \frac{\sqrt{3}}{2} = \frac{3\sqrt{3}}{6}, \quad \frac{\sqrt{3}}{3} = \frac{2\sqrt{3}}{6} \] Jadi, \[ \frac{3\sqrt{3}}{6} - \frac{2\sqrt{3}}{6} = \frac{\sqrt{3}}{6} \] Sekarang kita substitusi kembali ke dalam rumus: \[ \frac{\frac{\sqrt{3}}{6}}{\frac{\sqrt{2}}{2}} = \frac{\sqrt{3}}{6} \times \frac{2}{\sqrt{2}} = \frac{2\sqrt{3}}{6\sqrt{2}} = \frac{\sqrt{3}}{3\sqrt{2}} = \frac{\sqrt{6}}{6} \] Maka, nilai dari \( \frac{\sin 60^{\circ} - \tan 30^{\circ}}{\cos 45^{\circ}} \) adalah \( \frac{\sqrt{6}}{6} \).

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