Differential Equations - Solving Differential Equations by Separation of Variables

Differential Equations - Solving Differential Equations by Separation of Variables

IB Year 6 | Grade 12

Find the particular solution of the following differential equations:

  1. \(\frac{y}{x} \frac{\mathrm{d}y}{\mathrm{d}x} = \frac{y^2 + 1}{x^2 + 1}\); \(y = 0\) when \(x = 1\)
  2. \(e^t \frac{\mathrm{d}s}{\mathrm{d}t} = \sqrt{s}\); \(s = 4\) when \(t = 0\)
  3. \(x^2 \frac{\mathrm{d}y}{\mathrm{d}x} + 1 + y^2 = 0\); \(y = 1\) when \(x = \frac{4}{\pi}\)
  4. \((1 + \cos 2x) \frac{\mathrm{d}y}{\mathrm{d}x} = y \sin 2x\); \(y = 2\) when \(x = \frac{\pi}{4}\)
Answer:(a) \(2y^2 = x^2 - 1\) ; (b) \(2\sqrt{s} = -\frac{1}{e^t} + 5\) ; (c) \(y = \tan \frac{1}{x}\) ; (d) \(y = \frac{2}{\sqrt{1 + \cos 2x}}\).

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