so i have a 2D curve f(x), i need to calculate end coordinates of both normal vectors, that are perpendicular to this curve at point x=a, with vector length=l.

simplest way to make it happen anyone?

thanks

everywhere i tried to find out how to solve system of linear equations like A*X=F, whre A is a matrix and X and F are vectors, the solution is X:=linsolve(A, F),

but in maple 14 linsolve doesn't work, so are there any analogues for this linsolve function in maple 14 or maybe another simple way to solve this system?

thanks