Use the method of variation of parameters to find a particular solution of the following differential equation. y''+9y=4

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answerhappygod
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Use the method of variation of parameters to find a particular solution of the following differential equation. y''+9y=4

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Use the method of variation of parameters to find a particularsolution of the following differential equation.
y''+9y=4sec3x
To use the method of variation of​ parameters, setup thedeterminant needed to calculate the Wronskian.
W= ?
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