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Problem
Problem
The sum of two vectors
A
and
B
is at right angles to their difference. Then a.
A
=
B
A = B
A
=
B
b.
A
=
2
B
A = 2B
A
=
2
B
c.
B
=
2
A
B = 2A
B
=
2
A
d. A
and
B** have the same direction
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