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View Compilation Error

0_0_35237401_9119.cpp: In function 'int main(int, char**)':
0_0_35237401_9119.cpp:10:53: error: 'sqrt' was not declared in this scope
   printf("%f\n",sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
                                                     ^


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