math.cpp
#include <cmath>
// constants
M_PI // 3.14159
M_E // 2.71828
// rounding
floor(2.945) // 2
trunc(2.945) // 2
// numerical operations
exp(1) // 2.71828
sqrt(16) // 4
log(2) // 0.693147
// NOTE: no built-in for factorial
// EXAMPLE
sin(4 * M_PI / 180) // 0.0697565
// find more at http://www.cplusplus.com/reference/cmath