You are using an out of date browser. It  may not display this or other websites correctly.
You should upgrade or use an 
alternative browser.
							
	
							
							
	
							
	
							
	
							
	
							
								
								
								
	
								
									
									
	
									
	
									
	
									
	
									
	
									
										
	
										
	
										
	
										
	
										
	
										
	
	
	
	
		
			
				- 
	
		
			
			G 
		
		
		
			
			sao mất số 2 r pạn, mk hơi khó hiểu giải thích dum mk di 
 
 
- 
	
		
			
			G 
		
		
		
			
			Sin^3x + Cos^3x = Sinx - Cosx
Cos3x - Cos4x + Cos5x = O
4(Sin^4x + Cos^4x) + căn3Sin4x = 2