Question:

If \( y_1 \) and \( y_2 \) are two different solutions of the ordinary differential equation \[ y'' + \sin(e^x)y = \cos(e^x), \quad 0<x<1, \] then which one of the following is its general solution on \( [0, 1] \)?

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For second-order ODEs, verify that the proposed solution includes arbitrary constants and satisfies the linearity of the equation.
Updated On: Feb 1, 2025
  • \( c_1 y_1 + c_2 y_2, \, c_1, c_2 \in {R} \)
  • \( y_1 + c(e^{x} - y_2), \, c \in {R} \)
  • \( e^x y_1 + c(e^{-x} - y_2), \, c \in {R} \)
  • \( c_1(y_1 + y_2) + c_2(y_1 - y_2), \, c_1, c_2 \in {R} \)
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The Correct Option is B

Solution and Explanation

Step 1: Structure of the solution. For a second-order linear differential equation, the general solution is a linear combination of independent solutions. Step 2: Analyzing the given options. - \( y_1 \) and \( y_2 \) are independent solutions. The correct form for a general solution incorporates these and an arbitrary constant \( c \). - Option (2) satisfies this structure as \( y_1 + c(e^x - y_2) \). Step 3: Conclusion. The correct answer is \( {(2)} \).
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