Jawaban:
1/4 (√6 + √2)
Penjelasan dengan langkah-langkah:
cos 15°
= cos (45° - 30°)
= cos 45° . cos 30° + sin 45° . sin 30°
= 1/2 √2 . 1/2 √3 + 1/2 √2 . 1/2
= 1/4 . (√6 + √2)
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Jawaban:
1/4 (√6 + √2)
Penjelasan dengan langkah-langkah:
cos 15°
= cos (45° - 30°)
= cos 45° . cos 30° + sin 45° . sin 30°
= 1/2 √2 . 1/2 √3 + 1/2 √2 . 1/2
= 1/4 . (√6 + √2)