cos a° = -2/3 ; 0
Matematika
fransiscaajt
Pertanyaan
cos a° = -2/3 ; 0<a<180°, maka sin a° =
1 Jawaban
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1. Jawaban eripane05
Trigonometri.
cos a = -2/3
cos^2 a = 4/9
1- cos^2 a = 1- 4/9
sin^2 a = 5/9
sin a = √(5/9) = 1/3 √5