i don't know how to prove the following limits
limit of ( 1 - cos x) / x^2 when x is +infinity
limit of (tan4x) / 6 when x is 0
limit of (sin x^2) / x
in the first equation i got to the point of multiplying by the reciprocal but i don't know what to do next
in the second equation i converted tan to sin/cos but i dont know where to go from there