tangent inverse in C++ and other Math functions

• atan2(y, x) seems to be the best function
  
• giving two arguments allows function to find best angle in 0 to 2PI by matching signs
  
• the include file is
  

discussed at this forum

LIST OF MATHEMATICAL FUNCTIONS

http://www.cplusplus.com/reference/clibrary/cmath/

NOTE: 

1.35^2 does not work in C++. We need to use pow(1.35, 2). SUCKS MAN!!!