What is the excluded value of x2+2x+1x2−1\dfrac{x^2 + 2x + 1}{x^2 - 1}x2−1x2+2x+1?
x=1x = 1x=1 and x=−1x = -1x=−1
x=1x = 1x=1 only
x=−1x = -1x=−1 only
No excluded values