var('x')
f(x)=sqrt(x)
x0=1;y0=f(x0)
df(x)=diff(f(x), x)
print df(x)
m=df(x0)
p1=plot(f(x), (x, -1, 2))
p2=plot(y0+m*(x-x0), (x, -1, 2), color='red')
show(p1+p2)
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1/2/sqrt(x)
verbose 0 (2395: plot.py, generate_plot_points) WARNING: When plotting,
failed to evaluate function at 66 points.
verbose 0 (2395: plot.py, generate_plot_points) Last error message: ''
1/2/sqrt(x)
verbose 0 (2395: plot.py, generate_plot_points) WARNING: When plotting, failed to evaluate function at 66 points.
verbose 0 (2395: plot.py, generate_plot_points) Last error message: ''
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