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                        chapter1(Basic Concepts)  
                        
- Differential Equations(Unknown function /independent variable /order/degree) 35:19
 - Solutions 36:28
 - IVB & PVB 20:06
 - Find a solution ..... Fiind C1, C2 ,... 28:17
 - Example(1-9 , 1-11) 10:38
 - HW(1.14❌), (1.16), (1.17), (1.18) ,(1.19 ❌) ,(1.25a,d❌), 30(a,c,d) 22:21
 - HW 1.31(b,e) , (1.34❌) , (1.37❌) , 1.42 22:19
 - HW (1.48❌) , (1.52❌) 16:53
 - HW :( 1.15) , (1.24(c,d)) , (1.27(b, d)❌) ,( 1.30(b,e)) ,( 1.35 ❌), 1.39 , (1.45❌) ,1.51 , (1.53❌) 32:19
 - HW :1-21 , 1-27(c,e) 06:20
 - مراجعهpart1 13:02
 - مراجعهpart2 18:20
 - مراجعهpart3 11:34
 - مراجعهpart4 05:34
 
 
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                        chapter1(Basic Concepts)  
                        
 
