var('x')
f(x)=sec(x)
x0=pi/3;y0=f(x0)
df(x)=diff(f(x), x) # 미분
print df(x)
sec(x)*tan(x) sec(x)*tan(x) |
m=df(x0)
p1=plot(f(x), (x,0, 1.5))
p2=plot(y0+m*(x-x0), (x, 0.4, 1.5), color='red')
show(p1+p2)
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