正弦函数：对边/斜边

余弦函数：临边/斜边

import numpy as np

引入库numpy

import numpy as npX=np.linspace(-2,2,5,endpoint=True)print(X)

X=np.linspace(-2,2,5,endpoint=True)

从-2到2，线性的取5个点

import numpy as npimport matplotlib.pyplot as pltpi=np.piprint(pi)X=np.linspace(0,pi*2,500,endpoint=True)Y=np.sin(X)print(X)print(Y)A=type(X)print(A)plt.plot(X,Y)plt.show()

pi=np.pi 圆周率PI

X=np.linspace(0,pi*2,500,endpoint=True) 从0-2pi，取500点

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import matplotlib.pyplot as pltimport numpy as npX=np.linspace(-np.pi,np.pi,256,endpoint=True)C,S=np.cos(X),np.sin(X)plt.plot(X,C)plt.plot(X,S)plt.show()

y=ax^2+bx+c (一元二次方程)

import numpy as npimport matplotlib.pyplot as pltA=1B=2C=4A1=-2B1=-2C1=24X=np.linspace(-10,10,500,endpoint=True)Y=A*(X*X)+B*X+CY1=A1*(X*X)+B1*X+C1plt.plot(X,Y)plt.plot(X,Y1)plt.show()

y=x^2+2x+4

y1=-2x^2-2x+24