Math Problem Statement

\left|\sin\left(x\right)-\left(\frac{1}{2}+\frac{1}{\sqrt[2]{2}}\right)\right|\ge\frac{1}{2}+\frac{1}{\sqrt[2]{2}}

Solution

The given inequality is:

sin(x)(12+12)12+12\left|\sin(x) - \left(\frac{1}{2} + \frac{1}{\sqrt{2}}\right)\right| \geq \frac{1}{2} + \frac{1}{\sqrt{2}}

Step-by-step solution:

1. Define constants:

Let’s first simplify the constant part 12+12\frac{1}{2} + \frac{1}{\sqrt{2}}. 12+120.5+0.7071.207\frac{1}{2} + \frac{1}{\sqrt{2}} \approx 0.5 + 0.707 \approx 1.207

So, the inequality becomes: sin(x)1.2071.207|\sin(x) - 1.207| \geq 1.207

2. Interpret the absolute value inequality:

The general inequality ABC|A - B| \geq C can be split into two cases: sin(x)1.2071.207orsin(x)1.2071.207\sin(x) - 1.207 \geq 1.207 \quad \text{or} \quad \sin(x) - 1.207 \leq -1.207 which simplifies to: sin(x)1.207+1.207=2.414\sin(x) \geq 1.207 + 1.207 = 2.414 or sin(x)1.2071.207=0\sin(x) \leq 1.207 - 1.207 = 0

3. Analyze the sine function’s range:

The sine function sin(x)\sin(x) has a range between 1-1 and 11, i.e., 1sin(x)1-1 \leq \sin(x) \leq 1. However, sin(x)2.414\sin(x) \geq 2.414 is impossible because 2.4142.414 is outside the range of sine.

Thus, we are left with the inequality: sin(x)0\sin(x) \leq 0

4. Final answer:

The inequality holds true when sin(x)0\sin(x) \leq 0. This means xx must be in intervals where the sine function is non-positive, i.e., x[π,2π]x \in [\pi, 2\pi] (and other such intervals).

Conclusion:

The solution to the inequality is: sin(x)0\sin(x) \leq 0

This occurs in intervals like [nπ,(n+1)π][n\pi, (n+1)\pi], where nn is an integer.

Would you like more details or have any questions?

Here are some related questions:

  1. What are the solutions of the inequality sin(x)12\sin(x) \geq \frac{1}{2}?
  2. How would the inequality change if the constant was different?
  3. Can you explain how to solve inequalities with cos(x)\cos(x) instead of sin(x)\sin(x)?
  4. How do we solve sin(x)\sin(x)-based inequalities with absolute values?
  5. What are some other common trigonometric inequalities?

Tip: When solving inequalities with absolute values, always consider both positive and negative cases to cover all possibilities.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Inequalities
Absolute Value

Formulas

Absolute value inequality: |A - B| ≥ C can be split into two cases: A - B ≥ C or A - B ≤ -C
Range of sine function: -1 ≤ sin(x) ≤ 1

Theorems

Properties of the sine function
Absolute value inequalities

Suitable Grade Level

Grades 9-12