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Mathematics
Problem
Show that
(
a
−
b
)
×
(
a
+
b
)
=
2
(
a
×
b
)
(\mathbf{a} - \mathbf{b}) \times (\mathbf{a} + \mathbf{b}) = 2(\mathbf{a} \times \mathbf{b})
(
a
−
b
)
×
(
a
+
b
)
=
2
(
a
×
b
)
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