Partial derivative that contains the independent variable as an deriva

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SUMMARY

The discussion centers on the validity of calculating partial derivatives when the function includes independent variables, specifically in the context of the function f = f(x, t, dx/dt). Participants argue that while it may seem complex, it is indeed valid to consider such derivatives. An example provided illustrates how a force acting on a particle can depend on its position, speed, and time, emphasizing that different trajectories can yield the same speed but different positions, thereby affecting the partial derivative with respect to x.

PREREQUISITES
  • Understanding of partial derivatives in multivariable calculus
  • Familiarity with the concept of functions of multiple variables
  • Knowledge of the relationship between position, speed, and time in physics
  • Basic principles of calculus related to derivatives
NEXT STEPS
  • Study the application of partial derivatives in physics, particularly in mechanics
  • Learn about the chain rule in multivariable calculus
  • Explore examples of functions that depend on both independent variables and their derivatives
  • Investigate the implications of trajectory variations on force calculations in physics
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Students and professionals in mathematics, physics, and engineering who are dealing with multivariable functions and their derivatives, particularly in the context of dynamics and force analysis.

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Homework Statement



[itex]\frac{\partial f}{\partial t},\frac{\partial f}{\partial x}[/itex] where [itex]f=f(x,t,\frac{dx}{dt})[/itex]

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The Attempt at a Solution



I think it's impossible to consider it as a simple partial derivative.
 
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No, it's quite valid. E.g. suppose f represents a force which can act on a particle and depends on the position pf the particle, its speed, and time. A different trajectory of the particle could lead to its having the same speed at the same time, but be in a slightly different position. The affect on f would depend on the partial derivative wrt x.
 

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