Question

Pertanyaan Matematika di gambar: poin+
Terimakasih

Answer 1

Penjelasan dengan langkah-langkah:

Jawaban ada pada lampiran

Detail jawaban

Mata pelajaran : Matematika

kelas : 10

materi : Trigonometri

kode soal : 2

kode kategorisasi :10.27

Answer 2

Trigonometri

•

sin 15° cos 15°

= 1/2 sin 2(15°)

= 1/2 × 1/2

= 1/4 ✔

•

- (cos 5π/12 + cos π/12)

= - 2 cos (5π/12 + π/12)/2 cos (5π/12 - π/12)/2

= -2 cos π/4 cos π/6

= -2 × 1/2 √2 × 1/2 √3

= - 1/2 √6

•

3 sin 75° cos 15°

= 3/2 × 2 sin 75° cos 15°

= 3/2 (sin (75 + 15) + sin (75 - 15))

= 3/2 (1 + 1/2 √3)

= 3/4 (2 + √3)