Cos 195°Sin 195°Tolong kak/mba di jawab dung:)
Jawab:
Penjelasan dengan langkah-langkah:
nilai fungsi trigonometri
sudut relasi
soal
cos 195 = cos (180 + 15)
= – cos 15
= - { cos (45-30)}
= – { cos 45 .cos 30 + sin 45.sin30}
= – { ¹/₂√2 . ¹/₂√3 + ¹/₂√2 . ¹/₂}
= – { ¹/₄ √6 + ¹/₄ √2}
= - ¹/₄ (√6 + √2)
sin 195 = sin (180 + 15)
= – sin 15
= – { sin (45-30)}
= – { sin 45. cos 30 - cos 45. sin 30}
= – { ¹/₂√2 . ¹/₂√3 – ¹/₂√2. ¹/₂}
= – { ¹/₄ √6 – ¹/₄ √2}
= - ¹/₄ (√6 – √2)