Differential Equations Quiz
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Questions and Answers

The solution of
${dy \over dx} - x tan ( y - x) =$
is __________

  • ${sec^2 (y - x) = ce^{x^2 \over 2}}$
  • ln $sec^2 (y - x) = {x^2 \over 2} + c$
  • ${cos (y - x) = c. e^{x^2 \over 2}}$
  • ${sin (y - x) = c. e^{x^2 \over 2}}$ (correct)
  • An integrating factor of the D. E. :
    ${(1 + x^3){dy \over dx}+ 3x^2y = x^2}$ is _____

  • ${1 + x^3}$ (correct)
  • ${ln (1 + x^3)}$
  • ${3ln(1 + x^3)}$
  • ${(1 + x^3)^3}$
  • Study Notes

    Differential Equation

    • The provided equation is a first-order differential equation.
    • It involves the derivative of a function y with respect to x, denoted by dy/dx.
    • The equation also includes trigonometric functions (tan) and algebraic terms (x).

    Solution

    • The solution to this differential equation represents a family of functions y(x) that satisfy the given equation.

    • It is a particular solution and represents the relationship between the variables x and y in terms of an equation.

    • Obtaining the solution involves using techniques of solving differential equations, such as:

      • Separation of variables
      • Integrating factors
      • Substitution methods
    • Determining the solution would require applying one or more of these methods to the specific equation given.

    • The exact solution involves performing integration and potentially solving for y explicitly in terms of x.

    Example Solution

    • The provided equation is a first-order differential equation.

    • It involves the derivative of a function ‘y’‘y’‘y’ with respect to ‘x’‘x’‘x’, denoted by dy/dx{dy/dx}dy/dx.

    • The equation also includes trigonometric functions (tan) and algebraic terms (‘x’‘x’‘x’).

    • Solving this equation requires using techniques like substitution.

    • We begin by substituting u=y−x,du/dx=dy/dx−1u=y-x, \quad {du/dx}={dy/dx}-1u=y−x,du/dx=dy/dx−1

      • Substitute into the original equation: du/dx−1=xtan⁡(u).du/dx-1=x\tan(u).du/dx−1=xtan(u).
      • Separate variables to solve the differential equation: 1xtan⁡(u)+1du=dx\frac{1}{x\tan(u)+1}du=dx x tan(u)+11​du=dx.
    • The solution requires non-elementary function integration.The resulting differential equation requires solving techniques involving substitution and variable separation.on: ∫1xtan⁡(u)+1du=∫dx\int \frac{1}{x\tan(u)+1}du=\int dx∫xtan(u)+11​du=∫dx gives the solution of y(x) in an implicit form.

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    Description

    Test your understanding of solving differential equations with the given equation. This quiz focuses on the methods of solving first-order ordinary differential equations. Challenge yourself to apply your knowledge effectively.

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