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|veca pm vecb|^2 = |veca|^2 + |vecb|^2 p...

`|veca pm vecb|^2 = |veca|^2 + |vecb|^2 pm 2|veca||vecb|cos theta` and `(veca + vecb).(veca - vecb) = |veca|^2 - |vecb|^2`

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