4 lines
		
	
	
	
		
			78 B
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			4 lines
		
	
	
	
		
			78 B
		
	
	
	
		
			C
		
	
	
	
	
	
#include <math.h>
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#include "lib.h"
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double _atn(double x) { return atan(x); }
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