Final Answer
$4x\cos\left(x^2\right)$
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Step-by-step Solution
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1
Combining like terms $3x\cos\left(x^2\right)$ and $x\cos\left(x^2\right)$
$4x\cos\left(x^2\right)$
Final Answer
$4x\cos\left(x^2\right)$