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Limit gives wrong answer on both Mathematica 12.0 and Wolfram-Alpha
Limit[(Cos[x^2]/(x^2) - Cos[(x + 1)^2]/((x + 1)^2))/(1/(x^3)), x -> Infinity]
Plot[(Cos[x^2]/(x^2) - Cos[(x + 1)^2]/((x + 1)^2))/(1/(x^3)), {x, 0, 1000}]
The two results in this image are contradic …