const float PI = 3.14159265358979323846;

float abs(float f) {
    if(f < 0.0) {
        return -f;
    }
    return f;
}

void main() {
    test(abs(sin(0.0 * PI)));
    test(sin(0.5 * PI));
    test(abs(sin(1.0 * PI)));
    test(sin(1.5 * PI));
    test(abs(sin(2.0 * PI)));
    
    test(cos(0.0 * PI));
    test(abs(cos(0.5 * PI)));
    test(cos(1.0 * PI));
    test(abs(cos(1.5 * PI)));
    test(cos(2.0 * PI));
    
    test(abs(tan(0.0 * PI)));
    test(abs(tan(1.0 * PI)));
    test(abs(tan(2.0 * PI)));
}