Hello! I'm not sure if you are still having this issue, however I just 
tested your code on firefox and it is working fine for me! Is this still 
causing an issue for you? 

On Saturday, March 4, 2017 at 4:06:42 PM UTC-6, [email protected] wrote:
>
> I have SAGE installed in my computer (a MacBook), and the following code 
> works fine (I get the animation showing after a few seconds):
>
> def tangent_line(f,a,x=x):
>        f(x)=f
>        b=f(a)
>        df(x)=diff(f,x)
>        m=df(a)
>        result=b+m*(x-a)
>        return result
> f(x)=x^2
> L(a,x)=tangent_line(f(x),a)
> show(animate([plot((f(x),L(t,x)),x,-3.5,3.5,ymax=20,ymin=-20) for t in 
> sxrange(-3,3,0.5)]))
>
> The same code worked on SMC about 3-4 weeks ago, but now (in the last 
> couple of days) it no longer works.  The cell with the show command just 
> flashes forever (or at least 30 minutes). I tried with different computers 
> and different browsers and at different times of the day.
>
> Thanks for any help with this issue.
>
>
>

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