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Find the sum of all the coefficients in the binomial expansion of `(x^2+x-3)^(319)dot`

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=>`(x^2+x-3)^319=a_1+a_2x+a_3x^2.....a_639x^638`
=>let x=1,=>`-1=a_1+a_2+a_3.....a_639`
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