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Dot Product from Sum and Difference
$$\vec a\cdot\vec b=\frac{|\vec a+\vec b|^2-|\vec a-\vec b|^2}{4}$$
Usage
- Used when magnitudes of $$\vec a+\vec b$$ and $$\vec a-\vec b$$ are known.
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Dot Product from Sum and Difference
$$\vec a\cdot\vec b=\frac{|\vec a+\vec b|^2-|\vec a-\vec b|^2}{4}$$
Usage
- Used when magnitudes of $$\vec a+\vec b$$ and $$\vec a-\vec b$$ are known.
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