The eigenvalues for the symmetric matrix A are given. Find matrices D and P of an orthogonal diagonalization of A. 
Definitions:
Development Stage
Refers to a period or phase in an individual's life or in the evolution of a product or concept that represents a state of growth or progress.
Mowrer's Two-factor Theory
A psychological theory that explains learning and behavior as a combination of classical conditioning and operant conditioning.
Burrhus F. Skinner
A prominent American psychologist best known for his work in behaviorism and the development of the theory of operant conditioning.
Operant Conditioning
A learning process in which the strength of a behavior is modified by reinforcement or punishment, a key concept in behavioral psychology.
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