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F2 = 4
α = 0
R = √F1² + F2² + 2.F1.F2.cosα
cos0 = 1
√3² + 4²+ 2.3.4.1
√9+16 + 24
√25 + 24 = √49 = 7
F1 + F2 = 7
Kalo disuruh membuktikan menggunakan rumus saya belum bisa :v