Question 1

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Calculeu limit as x rightwards arrow +∞ of fraction numerator negative x to the power of 4 minus x cubed plus 7 times x squared plus 13 times x plus 6 over denominator 2 times x cubed minus 3 times x squared plus 1 end fraction

(escriviu el valor exacte. Si fos infinit, escriviu infinit_negatiu o infinit_positiu, segons s'escaigui)
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