# Revision history [back]

I looked all over and I just can't figure it out.

var('a');
var('x y z');
x = cos(a)^3;
y = sin(a)^3;
z = cos(2*a);

pl1=parametric_plot3d( (cos(t)^3, sin(t)^3, cos(2*t)), (t, 0, 2*pi));

a = pi/4;
pl2=parametric_plot3d( (x + t*(derivative(x)), y + t * (derivative(y)), z + t * (derivative(z))), (t,0,1), texture="red");


I looked all over and I just can't figure it out.

var('a');
var('x y z');
x = cos(a)^3;
y = sin(a)^3;
z = cos(2*a);

pl1=parametric_plot3d( (cos(t)^3, sin(t)^3, cos(2*t)), (t, 0, 2*pi));

a = pi/4;
pl2=parametric_plot3d( (x + t*(derivative(x)), y + t * (derivative(y)), z + t * (derivative(z))), (t,0,1), texture="red");

 3 retagged tmonteil 27383 ●31 ●203 ●517 http://wiki.sagemath.o...

I looked all over and I just can't figure it out.

var('a');
var('x y z');
x = cos(a)^3;
y = sin(a)^3;
z = cos(2*a);

pl1=parametric_plot3d( (cos(t)^3, sin(t)^3, cos(2*t)), (t, 0, 2*pi));

a = pi/4;
pl2=parametric_plot3d( (x + t*(derivative(x)), y + t * (derivative(y)), z + t * (derivative(z))), (t,0,1), texture="red");