Find the derivative of \( \sin x\left(x^{2}+3 x\right) \). \( \math...

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Find the derivative of \( \sin x\left(x^{2}+3 x\right) \).
\( \mathrm{P} \)
(1) \( \left(x^{2}+3 x\right) \cos x+\sin x(2 x+3) \)
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(2) \( \cos x(-2 x+3)+\sin x\left(x^{2}+3 x\right) \)
(3) \( \quad \sin x(2 x+3) \)
(4) \( \cos x\left(x^{2}+3 x\right) \)
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