October 2018 1 80 Report
Mau nanya : 1.penjelasan sin , cos , dan tan pada besaran vektor

2. saya menemukan jawaban seperti ini
R = 82 + 62 + 2.6.8.cos 30
R = 64 + 36 + 96 0,5 √3
R = 100 + 48√3
pertanyaannya bagaimana caranya cos 30 itu bisa berubah menjadi 0,5 √3? tolong dijelaskan !!!!!
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