)
>>> diff(cos(x)*sin(y), x, x, x) #多次求导（对x连续求3次偏导数）
sin(x)*sin(y)
>>> diff(cos(x)*sin(y), x,3) #与上式等价...sin(x)*sin(y)
>>> diff(sinh(x)/E**y, x,x,y,y,y)
-exp(-y)*sinh(x)
>>> diff(sinh(x)/E**y, x,2,y,3)#与上式等价...>>> sin(x).series(x,1,n=3)
sin(1) + (x - 1)*cos(1) - (x - 1)**2*sin(1)/2 + O((x - 1)**3, (x, 1))
极限的方向也是用...(n, 1, +oo)) # 调和级数，发散
oo
>>> summation(1/n**r, (n, 1, +oo)) # 仅当r>1时 收敛
Piecewise((zeta(r), r > 1),...>>> from sympy.integrals import laplace_transform
>>> from sympy.abc import t, s, a #导入多个符号变量
laplace_transform
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