kaka tolong bantu jawab soal no 1 yaa.. :-)
Matematika
Amalia2131
Pertanyaan
kaka tolong bantu jawab soal no 1 yaa.. :-)
1 Jawaban
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1. Jawaban whongaliem
90° ∠ β ∠ 180° ⇒ β di kuadran II , cos β dan tan β bernilai negatif
sin β = 1/2
sin² β + cos² β = 1
(1/2)² + cos² β = 1
1/4 + cos² β = 1
cos² β = 1 - 1/4
cos² β = 3/4
cos β = √(3/4)
cos β = - (1/2)√3
tan β = sin β / cos β
= (1/2) / - (1/2 √3)
= - 1/√3
= - (1/3)√3