View Compilation Error

0_0_30600398_8370.cpp: In function 'double dist(node, node)':
0_0_30600398_8370.cpp:26:54: error: expression cannot be used as a function
     return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)(a.y-b.y));
                                                      ^