Question

Yang nomor mana saja yang penting pakai caranya !

Answer 1

Verified answer

Mapel : Matematika
Tingkat : SMA
Bab : Himpunan , Trigonometri

Pembahasan :
6||

A = {a,b,c,d,e,f,g,h} = 8

Yang memiliki 3 elemen ?
= 8C3
= 8!/(8 - 3)!3!
= 8!/5!3!
= (8 x 7 x 6)/6
= 56

8||
Sin A = 3/5
Cos A = √[5² - 3²]/5 = (√16)/5 = 4/5

Cos B = 1/2 √3
Cos B = Cos 30°
B = 30°

Sin B = Sin 30°
Sin B = 1/2

Sin (A + B)
= Sin A Cos B + Cos A Sin B
= (3/5) (1/2 √3) + (4/5) (1/2)
= 3/10 √3 + 4/10
= (3√3 + 4)/10
= 1/10 (3√3 + 4)