Math Problem Statement

lim (x → 0) sin(3x) / 5x

Solution

The expression in the image is:

limx0sin(3x)5x\lim_{{x \to 0}} \frac{\sin(3x)}{5x}

To solve this limit, we can use the standard limit:

limx0sin(x)x=1\lim_{{x \to 0}} \frac{\sin(x)}{x} = 1

Rewriting the expression in a more convenient form, we can introduce a factor of 3 in the numerator and denominator:

limx0sin(3x)5x=limx03sin(3x)35x=35limx0sin(3x)3x\lim_{{x \to 0}} \frac{\sin(3x)}{5x} = \lim_{{x \to 0}} \frac{3 \cdot \sin(3x)}{3 \cdot 5x} = \frac{3}{5} \lim_{{x \to 0}} \frac{\sin(3x)}{3x}

Now, using the standard limit mentioned earlier:

limx0sin(3x)3x=1\lim_{{x \to 0}} \frac{\sin(3x)}{3x} = 1

Substitute this result back:

351=35\frac{3}{5} \cdot 1 = \frac{3}{5}

Thus, the limit is:

limx0sin(3x)5x=35\lim_{{x \to 0}} \frac{\sin(3x)}{5x} = \frac{3}{5}

Would you like more details or have any questions?

Further Related Questions:

  1. How can we use L'Hopital's Rule to solve this limit?
  2. What is the limit of sin(kx)mx\frac{\sin(kx)}{mx} as x0x \to 0 for any constants kk and mm?
  3. How do we evaluate limits involving trigonometric functions?
  4. What is the proof of the standard limit limx0sin(x)x=1\lim_{{x \to 0}} \frac{\sin(x)}{x} = 1?
  5. How do we compute limits of the form limxaf(x)g(x)\lim_{{x \to a}} \frac{f(x)}{g(x)} where both f(a)=0f(a) = 0 and g(a)=0g(a) = 0?

Tip:

When solving limits involving trigonometric functions, consider rewriting them in forms that make use of standard limits like limx0sin(x)x=1\lim_{{x \to 0}} \frac{\sin(x)}{x} = 1.

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Math Problem Analysis

Mathematical Concepts

Limits
Trigonometric Functions

Formulas

lim (x → 0) sin(x) / x = 1

Theorems

Standard Limit Theorem

Suitable Grade Level

Grade 10-12