Math Problem Statement
Solve the inequality to two decimal places where 0 ≤ 𝑥 ≤ 2𝜋, 4 cos(𝑥) + 2 > 𝜋
Solution
We are given the inequality:
and the interval for is .
Step 1: Simplify the inequality
First, subtract 2 from both sides of the inequality:
Now compute :
So the inequality becomes:
Step 2: Solve for
Now divide both sides of the inequality by 4:
Step 3: Determine the range of
We need to find the values of in the interval such that .
The cosine function is positive in the first and fourth quadrants, so we will find the reference angle where .
Using the inverse cosine function:
Thus, in the first quadrant, .
In the fourth quadrant, the corresponding solution is:
Step 4: Solution intervals
Since is greater than 0.285 between these values, the solution for is:
[ x \in [0, 1.28] \cup [5.00, 2\pi] ]
In decimal form:
[ x \in [0, 1.28] \cup [5.00, 6.28] ]
Thus, the values of that satisfy the inequality are in the intervals .
Do you have any further questions or want more details?
Here are 5 related questions to expand on this topic:
- How do you find the cosine of an angle in different quadrants?
- What are the properties of the cosine function over the interval ?
- Can you explain the significance of the inverse trigonometric functions?
- How does the cosine graph look in the range ?
- How would the solution change if the inequality was ?
Tip: Always ensure your calculator is in the correct mode (radians or degrees) based on the given problem context.
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Inequalities
Inverse Trigonometric Functions
Formulas
4 cos(x) + 2 > π
cos(x) = adjacent / hypotenuse
x = cos^(-1)(value)
Theorems
Cosine Function Properties
Range of the Cosine Function in the Interval [0, 2π]
Suitable Grade Level
Grades 11-12
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