#include <stdio.h>
#include <math.h>
#include <stdlib.h>

int main(int argc, char *argv[])
 {
	float	x, y, a = 0.3, b = 2.7;
	const double PI = 3.14159265;
		printf("Input x=\n");
		scanf( "%f", &x);

		if ( x<a || x>b) { 
		printf("\nError!");
system("PAUSE");	
return 0;
}

		y = (x*cos(PI/4) +(x*x)) / (1-2*x*(cos(x)*cos(x)*cos(x))*+x*x);
		printf(" y(%.2f) = %f\n ", x, y);
	
system("PAUSE");
	return 0;
}