## Problem 04 | Integrating Factors Found by Inspection

**Problem 04**

$2t \, ds + s(2 + s^2t) \, dt = 0$

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Problem 11 | Integrating Factors Found by Inspection

**Problem 11**

$y(x^2 + y^2 - 1) \, dx + x(x^2 + y^2 + 1) \, dy = 0$

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Problem 06 - 07 | Integrating Factors Found by Inspection

**Problem 06**

$y(y^2 + 1) \, dx + x(y^2 - 1) \, dy = 0$

**Problem 07**

$y(y^2 + 1) \, dx + x(y^2 - 1) \, dy = 0$

Problem 05 | Integrating Factors Found by Inspection

**Problem 05**

$y(x^4 - y^2) \, dx + x(x^4 + y^2) \, dy = 0$

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**Problem 04**

$2t \, ds + s(2 + s^2t) \, dt = 0$

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Problem 03 | Integrating Factors Found by Inspection

**Problem 03**

$(x^3y^3 + 1) \, dx + x^4y^2 \, dy = 0$

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Problem 02 | Integrating Factors Found by Inspection

**Problem 02**

$y(y^3 - x) \, dx + x(y^3 + x) \, dy = 0$

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**Problem 01**

$y(2xy + 1) \, dx - x \, dy = 0$

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