Jika 0°
Matematika
Hfweyg3784
Pertanyaan
Jika 0°<a<90°,nilai tan a = 2/5 √6, maka cos a adalah....
A. 2/7 √6
B. 5/6
C. 1/3 √6
D.5/7
E. 6/5 √6
A. 2/7 √6
B. 5/6
C. 1/3 √6
D.5/7
E. 6/5 √6
1 Jawaban
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1. Jawaban Anonyme
tanA = (2/5)√6 → y = 2√6 dan x = 5
r = √(y² + x²) = ¹((2√6)² + 5²) = 7
cosA = x/r = 5/7