File:90 degree rotations expressed in radian measure.svg - Wikipedia
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CK 12 Trigonometry Second Edition B v3 ZVD s1, PDF, Trigonometric Functions
Geometric Quantities
Turn (angle) - Wikiwand
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File:Rotation of a vector by 90 degrees.svg - Wikimedia Commons
Degree (angle) - Wikipedia
AN-1057: Using an Accelerometer for Inclination Sensing
List of trigonometric identities - Wikiwand
NetCDF Climate and Forecast (CF) Metadata Conventions
Mathematics Notes