By A Mystery Man Writer
File:Radian measure.svg - Wikimedia Commons
File:Rotation angles.svg - Wikimedia Commons
Euler angles - Wikipedia
Torque (article)
File:Rotation(60deg).svg - Wikimedia Commons
Trigonometric functions - Wikipedia
Euler angles - Wikipedia
File:30 degree rotations expressed in radian measure.svg
Radian - Wikipedia
Degree (angle) - Wikipedia
File:Rotation with rational angle 13 over 34.svg - Wikimedia Commons
If a surface has directional derivatives, does it also have