When do I use a·b = |a||b|cosθ in Vectors & 3D Geometry, and what does it mean?
dot product (scalar).
a·b = |a||b|cosθ — dot product (scalar). Use it when: θ is the angle between the vectors. Always check the condition holds before plugging in numbers.
Key point
a·b = |a||b|cosθ
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