(A) their total sum is zero
(B) two resolved parts in two directions at right angles are equal
(C) sum of resolved parts in any two per-pendicular directions are both zero
(D) all of them are inclined equally
(E) none of the above
(A) their total sum is zero
(B) two resolved parts in two directions at right angles are equal
(C) sum of resolved parts in any two per-pendicular directions are both zero
(D) all of them are inclined equally
(E) none of the above
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