Let š ā, š ā ā and š ā be three vectors such that |š ā| = 3, |š ā ā| = 4, |š ā| = 5 and each one of them being perpendicular to the sum of the other two, find |š ā + š ā ā + š ā|
Written on Jan. 11, 2019, 11:37 p.m.