Question

lim Vx-1 / x²-1 qdo x=1

Answer 1

$\lim_{x \to 1} \sqrt{\frac{x-1}{x^2-1}}=\lim_{x \to 1} \sqrt{\frac{x-1}{(x+1)(x-1)}}=\lim_{x \to 1} \sqrt{\frac{1}{x+1}}=\sqrt{\frac{1}{2}}$
Ou

$\frac{\sqrt2}{2}$