View Compilation Error

0_0_9395864_12543.cpp: In function `double F(double, double)':
0_0_9395864_12543.cpp:21: error: no matching function for call to `sqrt(double, double)'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/math.h:157: note: candidates are: double sqrt(double)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cmath:401: note:                 long double std::sqrt(long double)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cmath:397: note:                 float std::sqrt(float)