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cos 60 = 0.5
Fr = F₁² + F₂² + 2F₁F₂ Cos α
= 2²+3²+2. 2 . 3. cos 60
= 4+9+12 cos 60
= 13 + 12. cos 60
= 13 + 12 . / 2
= 13 + 6
= 19
kalau yg ditanyakan gambarnya, km bisa menggunakan metode jajar genjang :)