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parametric

Run Example
```(%i1)r(t) := [10*cos(t),2*sin(t),t];
(%o1)                  r(t) := [10 cos(t), 2 sin(t), t]
(%i2) r(4);
(%o2)                      [10 cos(4), 2 sin(4), 4]
(%i3) float(r(4));
(%o3)           [- 6.536436208636119, - 1.513604990615856, 4.0]
(%o4)            /usr/share/maxima/5.21.1/share/draw/draw.lisp
(%i5) draw3d(color=magenta,parametric(-cos(t), sin(t),cos(t), t,-4, 4));
plotdefine(rp(t), diff(r(t), t));
(%o6)                 rp(t) := [- 10 sin(t), 2 cos(t), 1]
(%i7) float(rp(1));
(%o7)            [- 8.414709848078966, 1.08060461173628, 1.0]
(%o8)           /usr/share/maxima/5.21.1/share/matrix/eigen.mac
(%i9) uvect(rp(t));
10 sin(t)                          2 cos(t)
(%o9) [- ---------------------------------, ---------------------------------,
2           2                      2           2
sqrt(100 sin (t) + 4 cos (t) + 1)  sqrt(100 sin (t) + 4 cos (t) + 1)
1
---------------------------------]
2           2
sqrt(100 sin (t) + 4 cos (t) + 1)
(%i10) trigsimp(rp(t));
(%o10)                    [- 10 sin(t), 2 cos(t), 1]
(%i11) define(T(t), trigsimp(rp(t)));
(%o11)                T(t) := [- 10 sin(t), 2 cos(t), 1]
(%i12) define(Tp(t), diff(T(t), t));
(%o12)               Tp(t) := [- 10 cos(t), - 2 sin(t), 0]
(%i13) uvect(Tp(t));
10 cos(t)                        2 sin(t)
(%o13) [- -----------------------------, - -----------------------------, 0]
2             2                  2             2
sqrt(4 sin (t) + 100 cos (t))    sqrt(4 sin (t) + 100 cos (t))
(%i14) trigsimp(uvect(Tp(t)));
10 cos(t)                2 sin(t)
(%o14)        [- --------------------, - --------------------, 0]
2                       2
sqrt(96 cos (t) + 4)    sqrt(96 cos (t) + 4)
(%i15) ```
Run Example
```r(t) := [10*cos(t),2*sin(t),t];
(%o1)                  r(t) := [10 cos(t), 2 sin(t), t]
(%i2) r(4);
(%o2)                      [10 cos(4), 2 sin(4), 4]
(%i3) float(r(4));
(%o3)           [- 6.536436208636119, - 1.513604990615856, 4.0]
(%o4)            /usr/share/maxima/5.21.1/share/draw/draw.lisp
(%i5) draw3d(color=magenta,parametric(-cos(t), sin(t),cos(t), t,-4, 4));
plotdefine(rp(t), diff(r(t), t));
(%o6)                 rp(t) := [- 10 sin(t), 2 cos(t), 1]
(%i7) float(rp(1));
(%o7)            [- 8.414709848078966, 1.08060461173628, 1.0]
(%o8)           /usr/share/maxima/5.21.1/share/matrix/eigen.mac
(%i9) uvect(rp(t));
10 sin(t)                          2 cos(t)
(%o9) [- ---------------------------------, ---------------------------------,
2           2                      2           2
sqrt(100 sin (t) + 4 cos (t) + 1)  sqrt(100 sin (t) + 4 cos (t) + 1)
1
---------------------------------]
2           2
sqrt(100 sin (t) + 4 cos (t) + 1)
(%i10) trigsimp(rp(t));
(%o10)                    [- 10 sin(t), 2 cos(t), 1]
(%i11) define(T(t), trigsimp(rp(t)));
(%o11)                T(t) := [- 10 sin(t), 2 cos(t), 1]
(%i12) define(Tp(t), diff(T(t), t));
(%o12)               Tp(t) := [- 10 cos(t), - 2 sin(t), 0]
(%i13) uvect(Tp(t));
10 cos(t)                        2 sin(t)
(%o13) [- -----------------------------, - -----------------------------, 0]
2             2                  2             2
sqrt(4 sin (t) + 100 cos (t))    sqrt(4 sin (t) + 100 cos (t))
(%i14) trigsimp(uvect(Tp(t)));
10 cos(t)                2 sin(t)
(%o14)        [- --------------------, - --------------------, 0]
2                       2
sqrt(96 cos (t) + 4)    sqrt(96 cos (t) + 4)
(%i15) define(N(t), trigsimp(uvect(Tp(t))));
10 cos(t)                2 sin(t)
(%o15)    N(t) := [- --------------------, - --------------------, 0]
2                       2
sqrt(96 cos (t) + 4)    sqrt(96 cos (t) + 4)
(%i16) ```
Run Example
```load(draw);
(%o1)            /usr/share/maxima/5.21.1/share/draw/draw.lisp