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m:=sqrt((c+x)^2+(a-z)^2);
n:=((c+x)/m)*((m^2+a^2-c^2)/(2*a*m))-((a-z)/m)*((sqrt(4*a^2*m^2-(m^2-c^2+a^2)^2))/(2*a*m));
o:=((m^2+c^2-a^2)/(2*c*m))*((c+x)/m)+((sqrt(4*c^2*m^2-(m^2+c^2-a^2)^2))/(2*c*m))*((a-z)/m);
p:=((a-z)/m)*((m^2+a^2-c^2)/(2*a*m))+((c+x)/m)*((sqrt(4*a^2*m^2-(m^2-c^2+a^2)^2))/(2*a*m));
q:=((sqrt(4*c^2*m^2-(m^2+c^2-a^2)^2))/(2*c*m))*((x+c)/m)-((m^2+c^2-a^2)/(2*c*m))*((a-z)/m);
H:=c1*(f-l)+c1*(n*(a+b)+o*(c+d))-u;
E:=s1*(f-l)+s1*(n*(a+b)+o*(c+d))-v;
F:=sita1+k-g-a+p*(a+b)-q*(c+d)-w;
G:=c1^2+s1^2-1;
solve([H,E,F,G],[s1,c1,x,z]);

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