1 | initial version |

Thank you for quick answer!
But still we have a problem with plotting.
We have this equasions:
for sphere: parametric_plot3d((sin(u)*cos(v),sin(u)*sin(v),cos(u)),(v,0,2*pi),(u,0,2*pi))

for cylinder: parametric_plot3d((sin(v),cos(v),u),(v,0,2*pi),(u,0,2*pi))

and viviani's curve: parametric_plot3d((sin(v)*cos(v),sin(v)*sin(v),cos(v)),(v,0,2*pi))

and now we don't know how to put it all together. :(

2 | No.2 Revision |

Thank you for quick answer!
But still we have a problem with plotting.
We have this equasions:
for sphere: ~~parametric_plot3d((sin(u)~~*cos(v),sin(u)*sin(v),cos(u)),(v,0,2*pi),(u,0,2*pi))

```
parametric_plot3d((sin(u)*cos(v),sin(u)*sin(v),cos(u)),(v,0,2*pi),(u,0,2*pi))
```

for cylinder: ~~parametric_plot3d((sin(v),cos(v),u),(v,0,2~~*pi),(u,0,2*pi))

```
parametric_plot3d((sin(v),cos(v),u),(v,0,2*pi),(u,0,2*pi))
```

and viviani's curve: ~~parametric_plot3d((sin(v)~~*cos(v),sin(v)*sin(v),cos(v)),(v,0,2*pi))

```
parametric_plot3d((sin(v)*cos(v),sin(v)*sin(v),cos(v)),(v,0,2*pi))
```

and now we don't know how to put it all together. :(

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