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