" It is for d first time, one of best uses, of "WhatsApp" in its history, to circulate some important formulae in Mathematics"..!! (α в ¢)²= α² в² ¢² 2(αв в¢ ¢α) 1. (α в)²= α² 2αв в² 2. (α в)²= (α-в)² 4αв b 3. (α-в)²= α²-2αв в² 4. (α-в)²= f(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) ѕιη0° =0 ѕιη30° = 1/2 ѕιη45° = 1/√2 ѕιη60° = √3/2 ѕιη90° = 1 ¢σѕ ιѕ σρρσѕιтє σƒ ѕιη тαη0° = 0 тαη30° = 1/√3 тαη45° = 1 тαη60° = √3 тαη90° = ∞ ¢σт ιѕ σρρσѕιтє σƒ тαη ѕє¢0° = 1 ѕє¢30° = 2/√3 ѕє¢45° = √2 ѕє¢60° = 2 ѕє¢90° = ∞ ¢σѕє¢ ιѕ σρρσѕιтє σƒ ѕє¢ 2ѕιηα¢σѕв=ѕιη(α в) ѕιη(α-в) 2¢σѕαѕιηв=ѕιη(α в)-ѕιη(α-в) 2¢σѕα¢σѕв=¢σѕ(α в) ¢σѕ(α-в) 2ѕιηαѕιηв=¢σѕ(α-в)-¢σѕ(α в) ѕιη(α в)=ѕιηα ¢σѕв ¢σѕα ѕιηв. » ¢σѕ(α в)=¢σѕα ¢σѕв - ѕιηα ѕιηв. » ѕιη(α-в)=ѕιηα¢σѕв-¢σѕαѕιηв. » ¢σѕ(α-в)=¢σѕα¢σѕв ѕιηαѕιηв. » тαη(α в)= (тαηα тαηв)/ (1−тαηαтαηв) » тαη(α−в)= (тαηα − тαηв) / (1 тαηαтαηв) » ¢σт(α в)= (¢σтα¢σтв −1) / (¢σтα ¢σтв) » ¢σт(α−в)= (¢σтα¢σтв 1) / (¢σтв− ¢σтα) » ѕιη(α в)=ѕιηα ¢σѕв ¢σѕα ѕιηв. » ¢σѕ(α в)=¢σѕα ¢σѕв ѕιηα ѕιηв. » ѕιη(α-в)=ѕιηα¢σѕв-¢σѕαѕιηв. » ¢σѕ(α-в)=¢σѕα¢σѕв ѕιηαѕιηв. » тαη(α в)= (тαηα тαηв)/ (1−тαηαтαηв) » тαη(α−в)= (тαηα − тαηв) / (1 тαηαтαηв) » ¢σт(α в)= (¢σтα¢σтв −1) / (¢σтα ¢σтв) » ¢σт(α−в)= (¢σтα¢σтв 1) / (¢σтв− ¢σтα) α/ѕιηα = в/ѕιηв = ¢/ѕιη¢ = 2я » α = в ¢σѕ¢ ¢ ¢σѕв » в = α ¢σѕ¢ ¢ ¢σѕα » ¢ = α ¢σѕв в ¢σѕα » ¢σѕα = (в² ¢²− α²) / 2в¢ » ¢σѕв = (¢² α²− в²) / 2¢α » ¢σѕ¢ = (α² в²− ¢²) / 2¢α » Δ = αв¢/4я » ѕιηΘ = 0 тнєη,Θ = ηΠ » ѕιηΘ = 1 тнєη,Θ = (4η 1)Π/2 » ѕιηΘ =−1 тнєη,Θ = (4η− 1)Π/2 » ѕιηΘ = ѕιηα тнєη,Θ = ηΠ (−1)^ηα 1. ѕιη2α = 2ѕιηα¢σѕα 2. ¢σѕ2α = ¢σѕ²α − ѕιη²α 3. ¢σѕ2α = 2¢σѕ²α − 1 4. ¢σѕ2α = 1 − ѕιη²α 5. 2ѕιη²α = 1 − ¢σѕ2α 6. 1 ѕιη2α = (ѕιηα ¢σѕα)² 7. 1 − ѕιη2α = (ѕιηα − ¢σѕα)² 8. тαη2α = 2тαηα / (1 − тαη²α) 9. ѕιη2α = 2тαηα / (1 тαη²α) 10. ¢σѕ2α = (1 − тαη²α) / (1 тαη²α) 11. 4ѕιη³α = 3ѕιηα − ѕιη3α 12. 4¢σѕ³α = 3¢σѕα ¢σѕ3α 🍄🍄🍄🍄🍄 » ѕιη²Θ ¢σѕ²Θ=1 » ѕє¢²Θ-тαη²Θ=1 » ¢σѕє¢²Θ-¢σт²Θ=1 » ѕιηΘ=1/¢σѕє¢Θ » ¢σѕє¢Θ=1/ѕιηΘ » ¢σѕΘ=1/ѕє¢Θ » ѕє¢Θ=1/¢σѕΘ » тαηΘ=1/¢σтΘ » ¢σтΘ=1/тαηΘ » тαηΘ=ѕιηΘ/¢σѕΘ Important 👇👇👇👇 These r all d formulae of Maths for classes 9th,10th,11th,12th Kindly share d same with all parents n students, teachers as much as u can do...👍👍👍 Dedicated to all parents Almost all formula covered👌🍀