pytho sin(1/x)震荡间断点

import math
import numpy as np

from matplotlib import pyplot as plt

a=np.arange(-1,1,0.00001)




def sx(k):
    t1=math.sin(k)/k
    return t1

def sx1(k):
    t1=math.sin(1/k)
    return t1


b=[]
c=[]

for k in a:
    if k!=0:
        temp1=sx1(k)
        c.append(k)
        b.append(temp1)



plt.figure(figsize=(8,6))

plt.plot(c,b)