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বীজগাণিতিক সূত্রাবলী 1. (a+b)²= a²+2ab+b²2. (a+b)²= (a-b)²+4ab3. (a-b)²= a²-2ab+b²4. (a-b)²= (a+b)²-4ab5. a² + b²= (a+b)²-2ab.6. a² + b²= (a-b)²+2ab.7. a²-b²= (a +b)(a -b)8. 2(a²+b²)= (a+b)²+(a-b)²9. 4ab = (a+b)²-(a-b)²10. ab = {(a+b)/2}²-{(a-b)/2}²11. (a+b+c)² = a²+b²+c²+2(ab+bc+ca)12. (a+b)³ = a³+3a²b+3ab²+b³13. (a+b)³ = a³+b³+3ab(a+b)14. a-b)³= a³-3a²b+3ab²-b³15. (a-b)³= a³-b³-3ab(a-b)16. a³+b³= (a+b) (a²-ab+b²)17. a³+b³= (a+b)³-3ab(a+b)18. a³-b³ = (a-b) (a²+ab+b²)19. a³-b³ = (a-b)³+3ab(a-b)20. (a² + b² + c²) = (a + b + c)² – 2(ab + bc + ca)21. 2 (ab Read More >>>>