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Extreme Mathematics Lecture Video
The limit is 6.

Because both numerator and denominator are polynomials. When seeking the limit, we still look at the highest term (when X tends to infinity). The highest term of the numerator denominator is cubic, and the limit value should be the ratio of the coefficients of the highest term of the numerator denominator. Can the numerator and denominator be divided by x at the same time to find the limit? . The detailed process is shown in the figure.