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 5 Solving a trigonometric equation 4 Resolve rational indefinite integral? 3 Explicit topological conjugation between two ODEs 2 Stable manifold for bidimensional nonlinear dynamic system with complex eigenvalues 2 Is $\gamma(t) = \left( A \cos(\sqrt{a} t),B \cos \! \left( \sqrt{b} t \right) \right)$ dense in the rectangle $[- A,A] \times [- B,B]$?

### Reputation (656)

 +15 Area of inscribed rectangle as a function of right triangle base +5 How many solutions does the equation $2i+j+3k=l$ have in nonnegative integers? +10 critical points, differential equation +5 self-adjoint operator without eigenvalues?

### Questions (9)

 6 Hints/Help studying an Abel Differential Equation 3 Doubt with smooth extensions 3 Center manifold of sets of equilibria 1 How many solutions does the equation $2i+j+3k=l$ have in nonnegative integers? 1 self-adjoint operator without eigenvalues?

### Tags (32)

 18 differential-equations × 17 4 indefinite-integrals 12 dynamical-systems × 9 4 integration 5 trigonometry × 2 3 matrices × 2 4 systems-of-equations × 6 2 analysis × 2 4 calculus × 3 2 complex-dynamics

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