Final answer to the problem
$y=c\sin\left(3x\right)+c^2\cos\left(3x\right)$
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Step-by-step Solution
1
Any expression to the power of $1$ is equal to that same expression
$y=c\sin\left(3x\right)+c^2\cos\left(3x\right)$
Final answer to the problem
$y=c\sin\left(3x\right)+c^2\cos\left(3x\right)$