void task2() {
    double e;
    int i = 1, x;
    int powerX = 1, power = 2;
    int fact = 1;
    double currentValueOfF = 0, sum = 0;

    printOnNewLine("Введите x: ");
    scanf("%d", &x);
    printOnNewLine("Введите e: ");
    scanf("%lf", &e);

    do
    {
        double divider = (cos(fact)) * i;
        if(divider != 0) {
            currentValueOfF = power / divider;
            sum += currentValueOfF;
        }

        fact *= i;
        printf("i is %d", i);
        powerX *= x;
        power = calculatePower(2, powerX);
        i++;
    } while (currentValueOfF > e);

    printf("approximate sum is %lf", sum);
}