Question: 2. $8 mathrm{y}^{prime prime}-6 mathrm{y}^{prime}+mathrm{y}=6 cosh mathrm{x}$ 3. $left(D^{2}+6 D+9 ight) y=72 sin ^{4} 3 x$ (By D - operator method) 4. $mathrm{y}^{prime prime prime}-4

$2. $8 \mathrm{y}^{\prime \prime}-6 \mathrm{y}^{\prime}+\mathrm{y}=6 \cosh \mathrm{x}$ 3. $\left(D^{2}+6 D+9 ight)$

2. $8 \mathrm{y}^{\prime \prime}-6 \mathrm{y}^{\prime}+\mathrm{y}=6 \cosh \mathrm{x}$ 3. $\left(D^{2}+6 D+9 ight) y=72 \sin ^{4} 3 x$ (By D - operator method) 4. $\mathrm{y}^{\prime \prime \prime}-4 \mathrm{y}^{\prime \prime}-\mathrm{y}^{\prime]+4 \mathrm{y}=30 \mathrm{e}^{\mathrm{x}}$ CS.SD. 126

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