Penjelasan dengan langkah-langkah:
cos 335= cos (360°-15°) rumus selisih 2 sudut
= cos 15°
= cos (45°-30°)
cos (a-b) rumus jumlah sudut
= cos a cos b + sin a sin b
= cos 45 cos 30 + sin 45 sin 30
= √3/2× √2/2 + √2/2× 1/2
= √6/4 + √2/4
= (√6+√2)/4 ✓
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Penjelasan dengan langkah-langkah:
cos 335= cos (360°-15°) rumus selisih 2 sudut
= cos 15°
= cos (45°-30°)
cos (a-b) rumus jumlah sudut
= cos a cos b + sin a sin b
= cos 45 cos 30 + sin 45 sin 30
= √3/2× √2/2 + √2/2× 1/2
= √6/4 + √2/4
= (√6+√2)/4 ✓