Angle Between Two Vectors (Dot Product) (cos θ = (a·b)/(|a||b|))
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cos θ = (a·b)/(|a||b|)
What each symbol means
| Symbol | What it stands for |
|---|---|
| \theta | Angle between directions of a and b |
| 0 ≤ θ ≤ π | Principal angle in vector sense |
When to use this
Non-zero vectors. For zero vector, angle undefined.