Divide: 2x+1÷4x2−1\dfrac{2}{x + 1} \div \dfrac{4}{x^2 - 1}x+12÷x2−14 (assume x≠±1x \neq \pm 1x=±1).
x−12\dfrac{x - 1}{2}2x−1
x+12\dfrac{x + 1}{2}2x+1
x2−12\dfrac{x^2 - 1}{2}2x2−1
2(x−1)4\dfrac{2(x-1)}{4}42(x−1)