function shili03
h0=figure('toolbar','none',...
    'position',[200 150 450 350],...
    'name','實例03');
x=-pi:0.05:pi;
y1=sin(x);
y2=cos(x);
plot(x,y1,...
    '-*r',...
    x,y2,...
    '--og');
grid on
xlabel('自變量X');
ylabel('函數值Y');
title('三角函數');