plot parametric curve from symbolic expressions
I would like to get the plot of the parametric curve $(x1(t),x2(t)$ for $t$ in $[0,1]$.
var('ts')
x1sol=vector([-cos(ts),sin(ts)])*exp(ts/2)
x11 = x1sol[0]
show(plot(x11(ts),x12(ts),(ts,0,1)))
I get the error: TypeError: unable to simplify to float approximation
I would like to avoid formulation as :
def x1(t): ....