Math Problem Statement

lim x -> 0 2x * cot x =***

Solution

We need to evaluate the limit:

limx02xcot(x)\lim_{{x \to 0}} 2x \cdot \cot(x)

We know that cot(x)=1tan(x)\cot(x) = \frac{1}{\tan(x)}, so the expression becomes:

limx02x1tan(x)=limx02xtan(x)\lim_{{x \to 0}} 2x \cdot \frac{1}{\tan(x)} = \lim_{{x \to 0}} \frac{2x}{\tan(x)}

Using the standard limit identity:

limx0xtan(x)=1\lim_{{x \to 0}} \frac{x}{\tan(x)} = 1

We then have:

limx02xtan(x)=2×1=2\lim_{{x \to 0}} \frac{2x}{\tan(x)} = 2 \times 1 = 2

Thus, the solution is:

limx02xcot(x)=2\lim_{{x \to 0}} 2x \cdot \cot(x) = 2

Would you like any further explanation or details on this?

Here are five related questions:

  1. What is the limit of limx0xsin(x)\lim_{{x \to 0}} \frac{x}{\sin(x)}?
  2. How do you find the limit of a product of functions as x0x \to 0?
  3. What is the behavior of cot(x)\cot(x) as x0x \to 0?
  4. Can L'Hôpital's Rule be applied to find this limit?
  5. How does the Taylor series expansion of trigonometric functions help with limits?

Tip: Memorizing common trigonometric limits, like limx0sin(x)x=1\lim_{{x \to 0}} \frac{\sin(x)}{x} = 1, can greatly speed up solving such problems!

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Math Problem Analysis

Mathematical Concepts

Limits
Trigonometry

Formulas

lim(x -> 0) 2x * cot(x)
lim(x -> 0) (x/tan(x)) = 1

Theorems

Limit Theorems
Standard Trigonometric Limits

Suitable Grade Level

Grades 10-12