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GATE ECE 2006 | Question-27

For the differential equation $\frac{d^2 y}{d x^2}+k^2 y=0$, the boundary conditions are

  1. $y=0$ for $x=0$, and
  2. $y=0$ for $x=a$

The form of non-zero solutions of $y$ (where $m$ varies over all integers) are

  1. $y=\sum_m \mathrm{~A}_m \sin ^{\frac{m \pi x}{a}}$
  2. $y=\sum_m \mathrm{~A}_m \cos ^{\frac{m \pi x}{a}}$
  3. $y=\sum_m \mathrm{~A}_m x^{\frac{m \pi}{a}}$
  4. $y=\sum_m \mathrm{~A}_{m} e^{-\frac{m \pi x}{a}}$
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