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xulang1214

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t=1;
det=72;
u=0.1;
a=10:5:90;
r=20;
m=0.82;
syms a m;
ezplot('2600-2*pi*r*t*det*(1+u*cotd(a/2)).*(1-m).*(3-2*cosd(a/2))')
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xulang1214

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