Linear Sine Function 17C8Ba
1. **Problem Statement:** We are given the function $f(x) = 2x - 3 \sin(x)$ and asked to analyze it.
2. **Formula and Explanation:** The function combines a linear term $2x$ and a sinusoidal term $-3 \sin(x)$. The linear term causes the function to increase steadily, while the sine term causes oscillations.
3. **Key Properties:**
- The sine function oscillates between $-1$ and $1$, so $-3 \sin(x)$ oscillates between $-3$ and $3$.
- The linear term $2x$ dominates for large $|x|$, making the function grow positively or negatively without bound.
4. **Evaluate at $x=0$:**
$$f(0) = 2 \cdot 0 - 3 \sin(0) = 0 - 0 = 0$$
So the curve passes through the origin $(0,0)$.
5. **Behavior:**
- For small $x$, the sine term causes oscillations around the line $y=2x$.
- The function is continuous and differentiable everywhere.
6. **Derivative:**
$$f'(x) = \frac{d}{dx}(2x) - \frac{d}{dx}(3 \sin(x)) = 2 - 3 \cos(x)$$
This derivative helps find extrema.
7. **Extrema:**
Set $f'(x) = 0$:
$$2 - 3 \cos(x) = 0 \implies \cos(x) = \frac{2}{3}$$
Solutions for $x$ are where $\cos(x) = \frac{2}{3}$, giving local maxima and minima.
**Final summary:** The function $f(x) = 2x - 3 \sin(x)$ is a continuous curve passing through $(0,0)$, oscillating due to the sine term, and increasing overall due to the linear term $2x$.