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View Compilation Error

0_0_31544341_19061.cpp: In function 'int main()':
0_0_31544341_19061.cpp:10:34: error: 'pow' was not declared in this scope
         double d=sqrt(pow(x1-x2,2)+pow(y1-y2,2));
                                  ^
0_0_31544341_19061.cpp:10:48: error: 'sqrt' was not declared in this scope
         double d=sqrt(pow(x1-x2,2)+pow(y1-y2,2));
                                                ^


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