[tex]\displaystyle\bf\\y=2x^{2} \cdot Sinx\\\\\\y'=(2x^{2} )'\cdot Sinx+2x^{2}\cdot(Sinx)'= 2\cdot 2x\cdot Sinx+2x^{2} \cdot Cosx=\\\\\\=4xSinx+2x^{2} Cosx[/tex]