Kak tolong materi trigonometri​

Jawab:

Penjelasan dengan langkah-langkah:

ΔABC siku di B

dan <C = α

AC² = AB² + BC²

AC² = 2²+4² =20

AC= √20

AC= 2√5

sin α= AB/AC  =  2/2√5 = 1/√5 =  ¹/₅ √5

cos α= BC/AC = 4/2√5 = 2/√5 =  ²/₅ √5

tan α=  AB/BC = 2/4 = ¹/₂

cosec α = 1/sin α = AC/AB = 2√5 /  2= √5

sec α = 1/cos α = 2√5 / 4 =  ¹/₂√5

cot α =  1/tan α=   BC/AB = 4/2 = 2