https://www.wolframalpha.com/input?i=discrete+lim+inf+of+%28-1%29%5En+as+n+-%3E+infinity
discrete lim inf of (-1)^n as n - infinity - Wolfram|Alpha
lim infof 1discreteinfinitywolfram
https://www.wolframalpha.com/input?i=lim+r-%3Einf+%28%281%2Fr+%281-1%2Fr%29%29%5E%28-3%2F2%29+%2F+r%5E%283%2F2%29%29
lim r-inf ((1/r (1-1/r))^(-3/2) / r^(3/2)) - Wolfram|Alpha
1 3 2limrinfalpha
https://www.wolframalpha.com/input/?i=lim%28%281%2F2%29%5En+*+3%5En+%2B+%281-%281%2F2%29%5En%29+*+0%2C+n%3Dinf%29&assumption=%22LimitHead%22+-%3E+%7B%22Discrete%22%7D
lim((1/2)^n * 3^n + (1-(1/2)^n) * 0, n=inf) - Wolfram|Alpha
lim 12 n3 0infwolfram