lim x -> 0 4x/ √1-2x - √1+2x

Lim x -> 0 4x/ √1-2x - √1+2x
4x ( √1 - 2x + √ 1+2x )/ (1 - 2x)(1+2x)
4x ( √1 - 2x + √ 1+2x )/ 1 +2x -2x -4x²
4x ( √1 - 2x + √ 1+2x )/ 4x² + 1
4.0 (√1 - 2.0 + √1 + 2.0)/ 4(0)² +1
√1 + √1 / 1
2√1 / 1
= 2√1