liza sasi lalka

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

double func1(double x, double y)
{
    return pow(cos(x), 4) + pow(sin(y), 2) + pow(sin(2 * x), 2) / 4 - 1;
}

double func2(double x, double y)
{
    return sin(y + x) * sin(y - x);
}

void main()
{
    int i = 1, choice; double x = 0, y = 0;
    do {
        printf("Choose operation :\n1. Enter the numbers\n2. Calculation Z1 = cos^4(x) + sin^(2y) + sin^2(2x)/4 - 1\n");
        printf("3. Calculation Z2 = sin(y + x) * sin(y - x)\n4. Exit\n");
        scanf("%d", &choice);
        switch (choice) {
        case 1: {
            printf("Write x, y\n");
            scanf("%lf%lf", &x, &y);
        }
                break;
        case 2: {
            printf("Z1 = %lf\n", func1(x, y));
        }
                break;
        case 3: {
            printf("Z2 = %lf\n", func2(x, y));
        }
                break;
        case 4: {
            i = 0;
        }
                break;
        default: {
            printf("Wrong variant\n");
        }
                break;
        }
    } while (i);
}