(x^3*cos(x/2)+1/2)*sqrt(4-x^2) Answer

5 min read Jun 17, 2024
(x^3*cos(x/2)+1/2)*sqrt(4-x^2) Answer

Analyzing the Function: (x^3 * cos(x/2) + 1/2) * sqrt(4 - x^2)

This function combines several interesting mathematical concepts and presents a challenge for both analytical and graphical analysis. Let's break it down:

Components of the Function

  • (x^3 * cos(x/2) + 1/2): This part involves a polynomial (x^3) multiplied by a cosine function (cos(x/2)) and a constant (1/2). The cosine function introduces periodic oscillations, while the polynomial provides a growing factor as x increases.
  • sqrt(4 - x^2): This represents the square root of a quadratic expression, indicating a semi-circular shape. The domain of this part is limited to -2 ≤ x ≤ 2.

Domain and Range

The function's domain is limited by the square root term, requiring 4 - x^2 ≥ 0. This leads to -2 ≤ x ≤ 2.

The range is more complex to determine analytically. Due to the cosine function, the function oscillates between positive and negative values. The polynomial term further amplifies these oscillations, and the square root term limits the output to non-negative values. This makes the range difficult to express precisely without further analysis.

Critical Points and Extrema

To find critical points, we need to differentiate the function and find its zeros. This process involves the product rule and chain rule for derivatives. The resulting derivative is quite complex, making it challenging to find analytical solutions.

Using numerical methods and graphing tools, we can find the critical points and potential extrema. The function exhibits several local maxima and minima within the domain.

Graphing the Function

The function's graph reveals its unique characteristics:

  • Shape: The graph oscillates with increasing amplitude as x moves away from 0, due to the combined effects of the polynomial and cosine terms. The square root term limits the graph to a semi-circular shape within the domain.
  • Asymptotes: The function does not have any vertical asymptotes. However, it has a horizontal asymptote at y = 0 as x approaches ±2.
  • Symmetry: The function is neither even nor odd, meaning it lacks symmetry about the y-axis or the origin.

Applications and Importance

Understanding the behavior of functions like this is essential in various fields, including:

  • Physics: Modeling oscillatory systems with varying amplitudes.
  • Engineering: Analyzing signals with periodic and non-periodic components.
  • Mathematics: Studying the interplay between different mathematical functions.


The function (x^3 * cos(x/2) + 1/2) * sqrt(4 - x^2) exhibits a complex and fascinating behavior, combining elements of polynomials, trigonometric functions, and square roots. While analytical analysis is challenging, numerical methods and graphical representations offer valuable insights into its domain, range, critical points, and overall behavior. Understanding this function contributes to a deeper appreciation of mathematical relationships and their applications in various fields.

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