I'm quite confused on this question.
Limit Cos [ (pi * x) / (1- 4x) ]
X -> infinity
What I thought it was was to divide everything by x so it would be
Cos (pi / (1/x) - 4)
So as x -> inf 1/x = 0.
So the answer would be
Cos (pi / 4)
am I doing this right?