> return Sqr((sin(EPoint[X]) + sin(EPoint[Y] + sin(EPoint[Z])))/3.0);

You probably mean  Sqr((sin(EPoint[X])+sin(EPoint[Y])+sin(EPoint[Z]))/3);

Temporary variables are do not affect the performance mostly though. The 
has to use several registers anyways. But to show the vector nature of this 
calculation it should be written as:

DBL value=0;
for(int i=0; i<3; i++) value+=sin(EPoint[i]);
return Sqr(value/3.0);

Of course this assumes that X,Y,Z are 0-2 index. 
 

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