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Misalkan F1 , F2 , F3
F1 [email protected]
F2 [email protected]
F3
Maka
F1 [email protected] + F2 [email protected]
R = F3 - (F1 [email protected]+F2 [email protected]) karena 180 derajat)
Jika hasil minus itu hanya arah dari R aja, gk usah bingung