Penjelasan dengan langkah-langkah:
a. cos 30° - sin 30°
= 1/2 √3 - 1/2
= √3/2 - 1/2
= (√3 - 1)/2
b. cos 30° cos 60° + sin 30° sin 60°
= 1/2 √3 × 1/2 + 1/2 × 1/2 √3
= 1/4 √3 + 1/4 √3
= 1/2 √3
TRIGONOMETRI KABATAKU
A. cos 30° – sin 30°
= cos 30° – sin (90° – 60°)
= cos 30° – cos 60°
= ½√3 – ½
= ½(√3 – 1)
B. cos 30°cos 60° + sin 30° sin 60°
= cos (30 – 60)°
= cos (–30)°
= cos 330°
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Penjelasan dengan langkah-langkah:
a. cos 30° - sin 30°
= 1/2 √3 - 1/2
= √3/2 - 1/2
= (√3 - 1)/2
b. cos 30° cos 60° + sin 30° sin 60°
= 1/2 √3 × 1/2 + 1/2 × 1/2 √3
= 1/4 √3 + 1/4 √3
= 1/2 √3
Penjelasan dengan langkah-langkah:
TRIGONOMETRI KABATAKU
A. cos 30° – sin 30°
= cos 30° – sin (90° – 60°)
= cos 30° – cos 60°
= ½√3 – ½
= ½(√3 – 1)
= –½(1 – √3) ✔
B. cos 30°cos 60° + sin 30° sin 60°
= cos (30 – 60)°
= cos (–30)°
= cos 330°
= ½√3 ✔