$$ \int_{(0,0)}^{(2,1}\left(\left(x^{2}-y^{2} ight) \mathrm{d} X-2 x y \mathrm{-d} y ight] $$ (a) $y=\frac{1}{4} X^{2}$ (b) $x=2 t^{2}, y=t$ CS.SD. 125 $$ \int_{(0,0)}^{(2,1}\left(\left(x^{2}-y^{2} ight) \mathrm{d} X-2 x y \mathrm{-d} y ight] $$ (a) $y=\frac{1}{4} X^{2}$ (b) $x=2 t^{2}, y=t$ CS.SD. 125