How to write this mathematical formula in C++?

Question

I have a simple formula and I want to use it in C++ application. Not sure how to rewrite in C++.

Answer 1

logn(5, abs((a*b - d*c) / (tan(c) + sin(d))))

where logn is:

double logn(double base, double x) {
    return log(x) / log(base);
}

and the header cmath is included for the other functions.