jika cos teta = √5/5 nilai cotan (90-teta) =

Mapel : Matematika
Kelas : X SMA
Bab : Trigonometri

Pembahasan :
Cos β = √5/5

Depan = √5
Miring = 5
Samping = √[5² - (√5)²] = 2√5

Cotan (90 - β)°
= Tan β
= (√5)/(2√5)
= 1/2