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= 4. cos
= 4.
= 2.√3
= 6√3 .(- 1)
= - 6√3
=
= 0
Σ
= - 4√3
=
= 4 .
= 2
= 6√3 . (0)
= 0
= 2 . (- 1)
= - 2
Σ
= 0
R =
=
= √12
= 2√3 N ...jawaban B