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+## Orthogonal Polynomials
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+**Description:**
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+The OrthPol(KF, n, x) function computes orthogonal polynomials: Chebyshev, Laguerre, Hermite polynomials, and their derivatives using recurrence relations.
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+
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+**Parameters:**
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+1. KF - parameter specifying the orthogonal polynomial
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+ * KF = 1 for Chebyshev polynomial of the first kind
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+ * KF = 2 for Chebyshev polynomial of the second kind
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+ * KF = 3 for Laguerre polynomial
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+ * KF = 4 for Hermite polynomial
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+2. n - integer order of orthogonal polynomial.
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+3. x - argument of orthogonal polynomial.
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+
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+**Return:**
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+Vector with values of the orthogonal polynomial (the first place) of order n with argument x, and its first derivatives (the second place).
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