import numpy as np
import pandas as pd
import sympy as sp
sp.init_printing(use_unicode=True)
import matplotlib.pyplot as plt
plt.rcParams['font.sans-serif']=['Times New Roman + SimSun + WFM Sans SC']
plt.rcParams['mathtext.fontset']='cm'

Times New Roman + SimSun + WFM Sans SC

simsum宋体, times new roman -*, simhei黑体, kaiti楷体,

dengxian等线, fangsong仿宋, Microsoft Yahei微软雅黑

plt.rcParams['axes.unicode_minus']=False
plt.rcParams['figure.dpi'] = 200

plt.rcParams['figure.figsize'] = [4, 3]

plt.rcParams['font.size'] = 12

plt.rcParams['xtick.direction'] = 'in'
plt.rcParams['ytick.direction'] = 'in'
x = np.linspace(-3, 3, 100)
y1 = np.cosh(x)
y2 = np.sinh(x)
y3 = np.exp(x)/2
plt.xlabel('x')
plt.ylabel('y')
plt.plot(x, y1, label= r'$\cosh x$')
plt.plot(x, y2, label= r'$\sinh x$')
plt.plot(x, y3, label= r'${\dfrac {1} {2} {\rm e}^x}$')
plt.legend()
plt.show()