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//pol_del.c
#include<stdio.h>
#include <math.h>
double fun(double t){return tan(t)2*t;}
main(){
double l,r,x,eps;
printf(%s, , \n);
scanf(%lf%lf%lf,&l,&r,&eps);
do {
x=(l+r)/2;
if (fun(x) < 0) l = x;
else r = x;
} while (r l > eps);
x = (l + r)/2;
printf( %12.8lf\n, x);
return 0;
}
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fun, .
