Mathematics · Differential Equations
The cusp locus of the differential equation F(x, y, p) = 0, whose complete primitive is F(x, y, c) = 0, is obtained by eliminating c among which set of equations?
- 1F = 0 only
- 2∂F/∂c = 0 only
- 3F = 0, ∂F/∂c = 0 and ∂2F/∂c2 = 0✓
- 4F = 0 and ∂F/∂c = 0
Correct answer
F = 0, ∂F/∂c = 0 and ∂2F/∂c2 = 0
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