Программирование C++

решить задание №17

помогите исправить код.

#include

#include

#define menshe (x, a, b) \

     (a+sin*(b *x) + cos*(pow(x,2)))

#define ravno (x, a, b) \

     (pow((a + b * x), 1/3) + sin*z*x)

#define bolshe (x, z) \

     (log(a+ b*x+z))

using namespace std;

float check(float x, float a, float b, float z)

{

     if (x >= log(b))

           return bolshe(x, a, b);

     else if (x <= a)

           return menshe(x, a, b);

     else if    (a < x < log(b))

           return ravno (x, z);

}

void main()

{

     setlocale(0, "");

     float x, y, a, b, z;

     cout << "input x please: ";

     cin >> x;

     a = -1.2;

     b = -0.75;

     z = log(tan(b*x));

     y = check(x, a, b, z);

     cout << "\nWith 1 var. of par. we got y = " << y << endl;</p><p>     a = 0.4;</p><p>     b = 2.4;</p><p>     z = log(tan(b * x));</p><p>     y = check(x,a, b, z);</p><p>     cout << "\nWith 2 var. of par. we got y = " << y << endl;</p><p>     a = 1.1;</p><p>     b = 6.1;</p><p>     z = log(tan(b * x));</p><p>     y = check(x, a, b,z);</p><p>     cout << "\nWith 3 var. of par. we got y = " << y << endl;</p><p>     system("pause");

}