float PI = 3.1415926535897932384;

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)));
    
    test(abs(asin(sin(0.0))));
    test(abs(asin(sin(0.5))));
    test(abs(asin(sin(1.0))));
    test(abs(asin(sin(1.5))));
    
    test(abs(acos(cos(0.0))));
    test(abs(acos(cos(0.5))));
    test(abs(acos(cos(1.0))));
    test(abs(acos(cos(1.5))));
    
    test(abs(atan(tan(0.0))));
    test(abs(atan(tan(0.5))));
    test(abs(atan(tan(1.0))));
    test(abs(atan(tan(1.5))));
    
    test(ln(256.0) / ln(2.0));
    test(log(256.0) / log(2.0));
    test(log(1000.0));
    test(sqrt(2.0));
    test(sqrt(10000.0));
    
    test(pow(2.0, 3.0));
    test(pow(2.0, 0.5));
}