求二阶导数y=x^2sin(5x-3)

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先求一阶导数,y'=2xsin(5x-3)+5x^2cos(5x-3)
二阶导数为y''=2sin(5x-3)+10xcos(5x-3)+10xcos(5x-3)-25x^2sin(5x-3)
=2sin(5x-3)+20xcos(5x-3)-25x^2sin(5x-3)