GATE ME 2025 Set 1 — Question 47
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Engineering Mathematics → Differential Equations → Euler-Cauchy Equation
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Question
Let be the solution of the differential equation with the initial conditions given below. If , then the value of is ____________ (rounded off to 2 decimal places).
Correct answer
0.45 to 0.55
Solution
The given differential equation is a Cauchy-Euler equation:Let , then the equation transforms to a linear differential equation with constant coefficients:where . The auxiliary equation is , which gives repeated roots .
The general solution in terms of is . Substituting back :Using the initial conditions:
Thus, the particular solution is .
At , .
Comparing this with , we find .
The general solution in terms of is . Substituting back :Using the initial conditions:
1..
2..
At , .Thus, the particular solution is .
At , .
Comparing this with , we find .
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