2014Dec08
0

Most use full msg for all. (a+b+c)²= a²+b²+c²+2(ab+bc+ca) 1. (a+b)²= a²+2ab+b² 2. (a+b)²= (a-b)²+4ab 3. (a-b)²= a²-2ab+b² 4. (a-b)²= (a+b)²-4ab 5. 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)² 9. 4ab = (a + b)² -(a-b)² 10. ab ={(a+b)/2}²-{(a-b)/2}² 11. (a + b + c)² = a² + b² + c² + 2(ab + bc + ca) 12. (a + b)³ = a³ + 3a²b + 3ab² + b³ 13. (a + b)³ = a³ + b³ + 3ab(a + b) 14. (a-b)³=a³-3a²b+3ab²-b³ 15. a³ + b³ = (a + b) (a² -ab + b²) 16. a³ + b³ = (a+ b)³ -3ab(a+ b) 17. a³ -b³ = (a -b) (a² + ab + b²) 18. a³ -b³ = (a-b)³ + 3ab(a-b) 🌺🌺🌺🌺🌺🌺🌺🌻🌻 Sin0° =0 Sin30° = 1/2 Sin45° = 1/√2 Sin60° = √3/2 Sin90° = 1 Cos is opposite of sin tan0° = 0 tan30° = 1/√3 tan45° = 1 tan60° = √3 tan90° = ∞ cot is opposite of tan sec0° = 1 sec30° = 2/√3 sec45° = √2 sec60° = 2 sec90° = ∞ cosec is opposite of sec 🎒🎒🎒🎒🎒🎒🎒🎒🎒🎒🎒 2sinAcosB=sin(A+B)+sin(A-B) 2cosAsinB=sin(A+B)-sin(A-B) 2cosAcosB=cos(A+B)+cos(A-B) 2sinAsinB=cos(A-B)-cos(A+B)

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