Vai su: http://www.WolframAlpha.com e cerca:
vector
unit vector
vector norm
scalar
normalized vector
direction cosine
linear combination
dot product
inner product
cross product
vectorial product
determinant
torque formula
(torque = moment of force)
plane
plot z=sin(x)*cos(y) x=-pi..2*pi y=-pi/2..2*pi+pi/2
stationary points (3*x+1)*y^3 + x^2*y
quadratic surfaces
 ALTRO