limit as x approaches 1 of 1/((x^2-1))

解答

x \to 1 lim (\frac{1}{( x ^{2} - 1 )})

发散

求解步骤

x \to 1 lim (\frac{1}{x ^{2} - 1})

若

x \to a^{-} lim f (x) \neq = x \to a^{+} lim f (x)

则极限不存在

x \to 1 + lim (\frac{1}{x ^{2} - 1}) = \infty

x \to 1 - lim (\frac{1}{x ^{2} - 1}) = - \infty

= 发散

\int_{- 4}^{0} f (x) d x

n = 1 \sum \infty cos^{n} (1)

n = 0 \sum \infty (0.02)^{n}

\int 5 e^{x} d x

x \to 4 lim (x - 4)