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Problem
Problem
Obtain the angle between
A
+
B
A + B
A
+
B
and
A
−
B
A - B
A
−
B
if
A
=
2
i
^
+
3
j
^
A = 2\hat{i} + 3\hat{j}
A
=
2
i
^
+
3
j
^
and
B
=
i
^
−
2
j
^
B = \hat{i} - 2\hat{j}
B
=
i
^
−
2
j
^
.
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