积分和求导的顺序交换

[213cy]

[213cy]

axis off
set(gca,'defaulttextFontSize',16)%%'defaulttextInterpreter','latex',
%%
%not support \[ \]
k1='如果f(x,y)可以反复使用全微分公式展开,即若有:';
k2='f(x,y)=\sum\limits_{k,m,n=0}^\infty a_kx^my^n ';
k3='则有:';
k4='\frac{d}{dx}\int f(x,y)dy=\sum\limits_{k,m,n}a_k \frac{d(x^m)}{dx} \int y^ndy =\int \frac{\partial f(x,y)}{\partial x}dy  ';

text(0,0.8,['',k1,''])
text(0,0.6,['$$',k2,'$$'],'Interpreter','latex')
text(0,0.4,['',k3,''])
text(0,0.2,['$$',k4,'$$'],'Interpreter','latex')