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y''=-9y, Encontre um cosseno e um seno que resolvem d2y/dt2 = -9y.…

- - - - Concavity
      - Inflection points
    - - Quadratic approximation
      - Eigenvalues and eigenvectors of the second derivative
    - - The Hessian
      - The Laplacian
- - - - Stereographic projections
      - complex plane in control theory
      - Quadratic spaces