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syms x
y=asin(1/4);
d=4;
L=1200;
I=1200;
A=-L*tan(y)^2*tan(x);
B=d^2+1/4*L^2*tan(y)^2-d^2*tan(y)^2*tan(x)^2;
C=B^(1/2);
D=2-2*tan(y)^2*tan(x)^2;
E=(A+2*C)/D;
F=tan(x)*E;
G=diff(F);
H=G*d*cos(y)*cos(x)^4/E^3
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