1 If z = 2x² – 3y with u = x2 siny and v = 2y cosx, determine expression дz дz for and ди ду дх ду ду ду 2 If u = x2 + 3

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1 If z = 2x² – 3y with u = x2 siny and v = 2y cosx, determine expression дz дz for and ди ду дх ду ду ду 2 If u = x2 + 3y and v= 2x + 3y, determine ди' ду? диду" Зу { 11 3 Ifz=f(x, y) whеrе x = uv and y = u? - v?, show that дz дz дz дz (а) 2х + 2y u- + дх ди ду Әz 1 az дz (b) 2 ду u2 + 2 ди ду 4 If y=f(x, y) and x =rcos and y = r sin e, show that агу ?у ? у 18V 12V + Эх2 ду? + Or2 V - + rar +7 902