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powmod - power function with remainder
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Calling Sequence
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powmod(a, n, b, x)
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Parameters
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a
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polynomial in x
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n
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integer
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b
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polynomial in x
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x
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name
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Description
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The powmod function computes  where a and b are polynomials in x and n is an integer, possibly negative. The case of n positive could also be computed as  but powmod is more efficient and uses the method of binary powering with remainder.
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