Calculate the function sin()

Question

For my studies, I have to code an algorithm to calculate sin() with this function:

Answer 1

Finally, I followed yours indications. Here is my final code :

double sinX(double x)
{
    double result = 1.0;
    double term_i = 1.0;
    int i = 2;

    x = fmod(x, 2*M_PI);

    for(i = 2; i<= 30; i+=2)
    {
        term_i = (-term_i * (x*x)) / (i*(i+1));
        result += term_i;
    }

    return x * result;
}