5. Solve the given equation by using the variation of parameter. y" + y = sec(x) tan (x). Using (i) Complex ミ○ -> yc=Ci Cos . + Ca Sin ... (ii) + Uz. ya Variation of Parameter w=1 第| u, 11以 yı ya U, If yå y2 y: f コ ly,' yo Solve

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Differential Equations: Please show all work so I can practice/understand, thank you =]
**Title: Solving Differential Equations Using Variation of Parameters**

**Problem Statement:**

Solve the given equation using the variation of parameters:

\[ y'' + y = \sec(x) \tan(x) \]

**Solution Steps:**

**Step 1: Homogeneous Solution (yc)**
\[ y_c = y_h + y_g = 0 \]
\[ y_c = C_1 \cos x + C_2 \sin x \]

**Step 2: Particular Solution (yp) Using Variation of Parameters**
\[ y_p = U_1 y_1 + U_2 y_2 \]

Here, 
\[ W = \begin{vmatrix}
y_1 & y_2 \\
y_1' & y_2'
\end{vmatrix} \]

where \( y_1 \) and \( y_2 \) are solutions to the homogeneous equation.

**Variation of Parameters:**

For \( U_1 \):

\[ U_1' = \frac{\begin{vmatrix}
0 & y_2 \\
f & y_2'
\end{vmatrix}}{W} \]

For \( U_2 \):

\[ U_2' = \frac{\begin{vmatrix}
y_1 & 0 \\
y_1' & f
\end{vmatrix}}{W} \]

Here, \( f = \sec(x) \tan(x) \) and \( W \) is the Wronskian determinant of the solutions to the homogeneous equation.
Transcribed Image Text:**Title: Solving Differential Equations Using Variation of Parameters** **Problem Statement:** Solve the given equation using the variation of parameters: \[ y'' + y = \sec(x) \tan(x) \] **Solution Steps:** **Step 1: Homogeneous Solution (yc)** \[ y_c = y_h + y_g = 0 \] \[ y_c = C_1 \cos x + C_2 \sin x \] **Step 2: Particular Solution (yp) Using Variation of Parameters** \[ y_p = U_1 y_1 + U_2 y_2 \] Here, \[ W = \begin{vmatrix} y_1 & y_2 \\ y_1' & y_2' \end{vmatrix} \] where \( y_1 \) and \( y_2 \) are solutions to the homogeneous equation. **Variation of Parameters:** For \( U_1 \): \[ U_1' = \frac{\begin{vmatrix} 0 & y_2 \\ f & y_2' \end{vmatrix}}{W} \] For \( U_2 \): \[ U_2' = \frac{\begin{vmatrix} y_1 & 0 \\ y_1' & f \end{vmatrix}}{W} \] Here, \( f = \sec(x) \tan(x) \) and \( W \) is the Wronskian determinant of the solutions to the homogeneous equation.
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