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Failed to insert picture - = find Lim {3 / (1 ^ 2 * 2 ^ 2) + 5 / (2 ^ 2 times 3 ^ 2) + +(2n+1)/n^2*(n+1)^2}

Failed to insert picture - = find Lim {3 / (1 ^ 2 * 2 ^ 2) + 5 / (2 ^ 2 times 3 ^ 2) + +(2n+1)/n^2*(n+1)^2}

What about the question?

High limit exercises
lim(cosx)1/x^2
x->0

Is it cosx-1,
Original formula = (- 1 / 2) x ^ 2) / x ^ 2
=-1

[[[limit problems of higher mathematics,]]
Why is LIM (e ^ t / T ^ 2) equal to positive infinity when t tends to positive infinity?

Robida's Law:
lim(e^t/t^2)=lim(e^2/2t)=lim(e^t/2)=+infinity