Math Problem Statement

Lim x 0 sin6x/sin2x

Solution

To solve the limit limx0sin(6x)sin(2x)\lim_{x \to 0} \frac{\sin(6x)}{\sin(2x)}, let's approach it step-by-step.

Step 1: Rewrite the expression using known limits

We can use the fact that limx0sin(kx)kx=1\lim_{x \to 0} \frac{\sin(kx)}{kx} = 1 for any constant kk.

Now, let's rewrite the given limit as follows:

limx0sin(6x)sin(2x)=limx0sin(6x)/xsin(2x)/x\lim_{x \to 0} \frac{\sin(6x)}{\sin(2x)} = \lim_{x \to 0} \frac{\sin(6x) / x}{\sin(2x) / x}

Step 2: Apply the limits

Now apply the known limits for sine at small values of xx: limx0sin(6x)/xsin(2x)/x=62=3\lim_{x \to 0} \frac{\sin(6x) / x}{\sin(2x) / x} = \frac{6}{2} = 3

Thus, the limit evaluates to:

3\boxed{3}

Would you like more details or have any other questions?

Here are five related questions:

  1. What is the limit of limx0sin(4x)sin(2x)\lim_{x \to 0} \frac{\sin(4x)}{\sin(2x)}?
  2. How does the small angle approximation for sine apply to this problem?
  3. How can L'Hopital's Rule be applied to compute similar limits?
  4. What is the general form of limits involving sin(kx)sin(mx)\frac{\sin(kx)}{\sin(mx)}?
  5. How would you evaluate limx0sin2(3x)sin2(x)\lim_{x \to 0} \frac{\sin^2(3x)}{\sin^2(x)}?

Tip: When working with trigonometric limits, small angle approximations like sin(x)x\sin(x) \approx x near zero are often very helpful.

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Math Problem Analysis

Mathematical Concepts

Limits
Trigonometric Functions
Sine Function

Formulas

lim(x -> 0) (sin(kx) / kx) = 1
Small angle approximation: sin(x) ≈ x near x = 0

Theorems

Limit of sine as x approaches 0
Small angle approximation for sine

Suitable Grade Level

Grades 11-12