https://www.wolframalpha.com/input?i=superior+limit+cos%281%2Fy%29+as+y+-%3E+0
superior limit cos(1/y) as y - 0 - Wolfram|Alpha
superior limitcos 10wolframalpha
https://www.wolframalpha.com/input?i=liminf+cos%281%2Fx%29+%2B+sin%28x%5E2%29
liminf cos(1/x) + sin(x^2) - Wolfram|Alpha
cos 1x sinliminf2wolfram