limit as x approaches (3pi)/4+of 2tan(2x)

解答

x \to \frac{3 π}{4} + lim (2 tan (2 x))

- \infty

求解步骤

x \to \frac{3 π}{4} + lim (2 tan (2 x))

x \to a lim [c \cdot f (x)] = c \cdot x \to a lim f (x)

= 2 \cdot x \to \frac{3 π}{4} + lim (tan (2 x))

使用极限链式法则:

- \infty

= 2 (- \infty)

运用无穷大属性:

c \cdot (- \infty) = - \infty

= - \infty

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