How do I get the inverse of a cosine, that is, cos(a) = x, I have x and I need to know a?  I don't
need the hyperbolic inverse, unless I can use it to get the cosine inverse.
Greetings,
Mario

Is there any tool (accompany with Visual Studio) which help me estimate the
speed (or time duration of my application) ?
Thanks

I try to allocate an array of pointer with this pieces of code:
int **a;
a = new (int *)[3];
but the compiler report that : missing ; before [.