var('x')
f(x)=x^2-7*x+12
x0=pi;y0=0
df(x)=diff(f(x), x)
print df(x)
m=df(x0)
p1=plot(f(x), (x, -15, 15))
p2=plot(y0+m*(x-x0), (x, -15, 15), color='green')
show(p1+p2)
2*x - 7 2*x - 7 |
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