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3^n - 3^{n - 1} - 3^{n - 2} is equal to:
39 - Rate of increase of angle of elevation of the line of sight
38 - Rate of rotation of search light pointing to a ship
38 - 40 Solved problems in maxima and minima
37-38 How fast a ship leaving from its starting point
37 - A ladder sliding downward
35-36 Time Rates: Lengthening of shadow and movement of its tip in 3D space
35 - 37 Solved problems in maxima and minima
33-34 Time Rates: A car traveling east and airplane traveling north
32 - 34 Maxima and minima problems of a rectangle inscribed in a triangle
316 Permissible Torque That Can Be Applied to a Compound Shaft
315 Power Applied and Removed at Shaft Gears
314 Maximum Shear and Relative Gear Rotation of a Compound Steel Shaft
313 Maximum Torque That Can be Applied to a Hollow Steel Shaft
312 Deformation of Flexible Shaft Made From Steel Wire Encased in Stationary Tube
311 Aluminum Shaft Loaded by Multiple Torques Applied at Gears
310 Strength Comparison of Hollow and Solid Steel Shafts of Equal Outside Diameters
31-32 Train in an elevated track and car in perpendicular road
309 Finding the Diameter of a Propeller Shaft Transmitting a Power
308 Maximum Horsepower That Can be Transmitted by Steel Shaft
307 Power Transmitted by Solid Steel Shaft of Unknown Diameter
306 Maximum Shearing Stress of Marine Propeller Shaft
305 Minimum Diameter of Steel Shaft With Allowable Angle of Twist
304 Maximum Shearing Stress and Angle of Twist of a Steel Shaft
30 - Two trains in perpendicular railroad tracks
3-Panel Truss with Flexible Cables Used as Diagonals