==========================
άͼĵ

x^2+y^2
-x^2-y^2

{x,-2,2}
{y,-2,2}
======================================================
άͼĵ
4+(3+cos(v))*sin(u)
4+(3+cos(v))*cos(u)
4+sin(v)

8+(3+cos(v))*cos(u)
3+sin(v)
4+(3+cos(v))*sin(u)

12+(3+cos(v))*sin(u)
4+(3+cos(v))*cos(u)
4+sin(v)

{u,0,2Pi}
{v,0,2Pi}
==========================================
άͼĵӣͬuvķΧͬ
(2+cos(8*u+v))*cos(u)
(2+cos(8*u+v))*sin(u)
sin(8*u+v)

{u,0,2Pi}
{v,0,Pi/2}

{u,0,2Pi}
{v,0,Pi}

{u,0,2Pi}
{v,0,3Pi/2}
======================================
һάͼһάͼĵ

(1+cos(v))*cos(u)+0.085*cos(5*u)+(0.994*v/pi)^100
(1+cos(v))*sin(u)
6*sin(v)+2*cos(v)-0.7*log(1-v/pi)

{u,-Pi,Pi}
{v,-Pi,Pi}
----------------------
sin(x*y)
{x, 0, 3}
{y, 0, 3}
==================================
άͼĵ
6+sin(v)
(4+cos(v))*sin(u)
6+(4+cos(v))*cos(u)

12+sin(v)
6+(4+cos(v))*sin(u)
(4+cos(v))*cos(u)

12+(4+cos(v))*sin(u)
(4+cos(v))*cos(u)
sin(v)

6+(4+cos(v))*sin(u)
6+(4+cos(v))*cos(u)
6+sin(v)

6+(4+cos(v))*cos(u)
sin(v)
(4+cos(v))*sin(u)

12+(4+cos(v))*cos(u)
6+sin(v)
6+(4+cos(v))*sin(u)

{u,0,2Pi}
{v,0,2Pi}
=================================




