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Flashcards in maths identites Deck (29):
1

(a + b)^2

a^2 + 2ab + b^2

2

(a – b)^2

a^2 – 2ab + b^2
(a+b)^2 - 4ab

3

a^2 – b^2

(a + b)(a – b)

4

(x + a)(x + b)

x^2 + (a + b) x + ab

5

(a + b + c)^2

a^2 + b^2 + c^2 + 2ab + 2bc + 2ca

6

(a + b)^3

a^3 + b^3 + 3ab (a + b)

7

(a – b)^3

a^3 – b^3 – 3ab (a – b)

8

a^3 + b^3 + c^3 – 3abc

(a + b + c)(a^2 + b^2 + c^2 – ab – bc – ca)

9

a^3 +b^3

(a+b)(a^2 -ab +b^2)

(a + b )^3 - 3ab(a+b)

10

a^3 -b^3

(a-b)(a^2 + ab +b^2)

(a - b)^3 + 3ab (a - b)

11

y

sinθ

12

x

cosθ

13

a^2 + b^2

(a + b)^2 - 2ab

14

D < 0

no real roots

15

D > 0

real and distinct

16

D = 0

real and equal roots

17

D is a perfect square

rational roots

18

D is not a perfect square

irrational roots

19

π/12

15

20

π/6

30

21

π/4

45

22

π/3

60

23

π/2

90

24

2 π/3

120

25

pie

180

26

3 pie/2

270

27

2 π

360

28

A=

1/2 * r^2 * θ

1/2 * r * &

29

&=

r * θ