2. (α+в)²= (α-в)²+4αв
3. (α-в)²= α²-2αв+в²
4. (α-в)²= (α+в)²-4αв
5. α² + в²= (α+в)² - 2αв.
6. α² + в²= (α-в)² + 2αв.
7. α²-в² =(α + в)(α - в)
8. 2(α² + в²) = (α+ в)² + (α - в)²
9. 4αв = (α + в)² -(α-в)²
10. αв ={(α+в)/2}²-{(α-в)/2}²
11. (α + в + ¢)² = α² + в² + ¢² + 2(αв + в¢ + ¢α)
12. (α + в)³ = α³ + 3α²в + 3αв² + в³
13. (α + в)³ = α³ + в³ + 3αв(α + в)
14. (α-в)³=α³-3α²в+3αв²-в³
15. α³ + в³ = (α + в) (α² -αв + в²)
16. α³ + в³ = (α+ в)³ -3αв(α+ в)
17. α³ -в³ = (α -в) (α² + αв + в²)
18. α³ -в³ = (α-в)³ + 3αв(α-в)
9th,10th,11th,12th.» B. A. — Bachelor of Arts.
» M. A. — Master of Arts. »B.tech - Bachelor of Technology
» B. Sc. — Bachelor of Science
» M. Sc. — Master of Science
» B. Sc. Ag. — Bachelor of Science in Agriculture
» M. Sc. Ag. — Master of Science in Agriculture
» M. B. B. S. — Bachelor of Medicine and Bachelor of Surgery
» B.A.M.S- Bachelor of Ayurved Medicine and surgery
» M. D. — Doctor of Medicine
» M. S. — Master of Surgery
» Ph. D. / D. Phil. — Doctor of Philosophy (Arts & Science)
» D. Litt./Lit. — Doctor of Literature / Doctor of Letters
» D. Sc. — Doctor of Science
» B. Com. — Bachelor of Commerce
» M. Com. — Master of Commerce
» Dr. — Doctor
» B. P. — Blood Pressure
» Mr. — Mister
» Mrs. — Mistress
» M.S. — miss (used for female married & unmarried)
» Miss — used before unmarried girls)
» M. P. — Member of Parliament
» M. L. A. — Member of Legislative Assembly
» M. L. C. — Member of Legislative Council
» P. M. — Prime Minister
» C. M. — Chief Minister
» C-in-C — Commander-In-Chief
» L. D. C. — Lower Division Clerk
» U. D. C. — Upper Division Clerk
» Lt. Gov. — Lieutenant Governor
» D. M. — District Magistrate
» V. I. P. — Very Important Person
» I. T. O. — Income Tax Officer
» C. I. D. — Criminal Investigation Department
» C/o — Care of
» S/o — Son of
» C. B. I. — Central Bureau of Investigation
» G. P. O. — General Post Office
» H. Q. — Head Quarters