Cosine of sum of two angles. Note the minus sign — it's the opposite of the sine formula.
Dot product — Vector dot product: A·B = |A||B|cos(θ).
Work calculation — W = F×d×cos(θ); work done by a force at an angle.
Radar systems — Bearing calculations for target tracking.
Crystal optics — Light polarization angle combinations.
Game physics — Collision detection using angle between vectors.
Satellite positioning — Orbital mechanics calculations.
Camera projection — 3D to 2D transformation.
Wind turbines — Optimal blade angle calculations.
Sports analytics — Ball trajectory angle analysis.
Machine learning — Cosine similarity in NLP.
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