Math Problem Statement

What is the limit of the function as x approaches infinity: lim (x → ∞) (x + sin(x) + sin(1/x)^2)?

Solution

The problem provided is:

limx(x+sin(x)+sin2(1x))\lim_{{x \to \infty}} \left( x + \sin(x) + \sin^2\left( \frac{1}{x} \right) \right)

Step-by-step solution:

  1. Term 1: xx

    As xx \to \infty, the linear term xx obviously tends to \infty.

  2. Term 2: sin(x)\sin(x)

    The sine function oscillates between -1 and 1 for all xx. Therefore, as xx \to \infty, sin(x)\sin(x) remains bounded, but it doesn't affect the overall limit much because it's relatively small compared to xx.

  3. Term 3: sin2(1x)\sin^2\left( \frac{1}{x} \right)

    As xx \to \infty, 1x\frac{1}{x} approaches 0. We know that sin(0)=0\sin(0) = 0, so:

    sin2(1x)sin2(0)=0\sin^2\left( \frac{1}{x} \right) \to \sin^2(0) = 0

    Therefore, this term tends to 0 as xx \to \infty.

Putting it all together:

limx(x+sin(x)+sin2(1x))=limx(x+(bounded)+0)=\lim_{{x \to \infty}} \left( x + \sin(x) + \sin^2\left( \frac{1}{x} \right) \right) = \lim_{{x \to \infty}} \left( x + \text{(bounded)} + 0 \right) = \infty

Thus, the overall limit is:

\boxed{\infty}

Would you like further clarification or details on any step?

Related Questions:

  1. What is the limit of x+sin(x)x + \sin(x) as xx \to \infty?
  2. How does the behavior of sin(x)\sin(x) change as xx increases?
  3. What are some common techniques for solving limits involving trigonometric functions?
  4. Can oscillating functions like sin(x)\sin(x) affect the overall growth of functions as xx \to \infty?
  5. What happens if sin2(1x)\sin^2 \left( \frac{1}{x} \right) is replaced with cos2(1x)\cos^2 \left( \frac{1}{x} \right)?

Tip:

When working with limits involving trigonometric functions, it's important to recognize when certain terms are bounded or oscillatory, as they often don't contribute much to the growth of the function at infinity.

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Math Problem Analysis

Mathematical Concepts

Limits
Trigonometric Functions
Asymptotic Behavior

Formulas

lim (x → ∞) f(x)
sin(x) oscillates between -1 and 1
sin^2(1/x) → 0 as x → ∞

Theorems

Limit Theorem
Oscillatory Functions in Limits

Suitable Grade Level

Grades 10-12 (Advanced High School Level)