Curated prompts

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Written by RIDA MATH. Each prompt says what a strong contribution looks like.

  1. University

    Three methods, one first-order equation

    Solve y′−3y=cos⁡2xy' - 3y = \cos 2x with y(0)=0y(0) = 0 by an integrating factor, by undetermined coefficients, and by the Laplace transform. Which method generalises best to y′−3y=x2cos⁡2xy' - 3y = x^2\cos 2x?

    A strong contribution: All three solutions agree; the comparison is specific about where each method's effort goes.

  2. University

    When the forcing matches the equation

    Compare y′′+y=sin⁡(ωx)y'' + y = \sin(\omega x) for ω≠1\omega \ne 1 and ω=1\omega = 1. What changes in the particular solution, and how does the change appear in the Laplace domain?

    A strong contribution: Identifies the repeated pole at s=±is = \pm i and the resulting factor of xx in the solution.

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