Classify each expression as a polynomial or not a polynomial. 3x^2−5x^4+2x−12 x^5−5x^4+4x^3−3x^2+2x−1 x^−5−5x^−4+4x^−3^−3x^−2+2x^−1−1 4√x-3+4√x−8x+16 x^3+7x^2+9x−5x^4−20

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