3≤ x≤ -3

-3≤ x≤ 3

3

x<3

x+y=2

x-y+2=0

x+y+2=0

2x+y=2

x+y+1=0

3x-y+1=0

3x+y+1=0

x+3y+1=0

$\frac{a_1}{b_1}+\frac{a_2}{b_2}+\frac{a_3}{b_3}=0$

$a_1{b}_1+a_2{b}_2+a_3{b}_3=0$

$\frac{a_1}{b_1}=\frac{a_2}{b_2}=\frac{a_3}{b_3}$

$a_1{b}_1-a_2{b}_2-a_3{b}_3=0$

25

15

80

35

12

6

16

64

8

64

2

5/12

$1+\frac{x}{1}+\frac{x^2}{2}+\frac{x^3}{3}+.....$

$x++\frac{x^2}{2!}+\frac{x^3}{3!}+.....$

$1+\frac{x}{1!}+\frac{x^2}{2!}+\frac{x^3}{3!}+.....$

$1+\frac{x}{1!}+\frac{x^2}{2!}+\frac{x^3}{3!}+.....$

√19

2√20

2√19

√20

${\sin }^{-1}\frac{1}{\sqrt{39}}$

${\cos }^{-1}\frac{1}{\sqrt{12}}$

${\cos }^{-1}\frac{-1}{\sqrt{39}}$

${\sin }^{-1}\frac{1}{13}$

$A+B+C=\mathrm{\pi }$

$\mathrm{A}+\mathrm{B}+\mathrm{C}=\frac{\mathrm{\pi }}{2}$

$\mathrm{A}+\mathrm{B}+\mathrm{C}=2\mathrm{\pi }$//www.w3.org/1998/Math/MathML">A+B+C=2π

$\mathrm{A}+\mathrm{B}+\mathrm{C}=\frac{\mathrm{\pi }}{4}$

250

522

252

504

151

27

18

127

$n^2(n+1)$

$n^3(n+1)$

$n(n+1)$

$2n(n+1)$

10

12

16

8

x

2x

$x^2$

$2x^2$

$\frac{1}{1+x^2}$

$-\frac{1}{1+x^2}$

$\frac{2}{1+x^2}$

$\frac{1}{1-x^2}$

1

-1

2

2

5

4

1

$-\sqrt{1-x^2}$

$\sqrt{1-x^2}$

$\frac{\mathrm{\pi }}{4}$

$\frac{\mathrm{\pi }}{3}$

$\frac{\mathrm{\pi }}{2}$

$\mathrm{\pi }$

$\mathrm{\pi }$

$\frac{\mathrm{\pi }}{3}$

$\frac{\mathrm{\pi }}{4}$

$\frac{\mathrm{\pi }}{2}$

$\frac{5}{18}$

$\frac{8}{21}$

$\frac{5}{21}$

$\frac{3}{17}$

2π

3π

4π

6π

{4,7}

{4,8}

{4,5,6,8}

{10, 7}

12

9

-11

11

2

1

3

4

(a-c)(a-b)(b-c)

(a-b) (b-c) (c-a)

(a-b)(c-b)(c-a)

(a-b)(a-c)(a-b)

x=5

x =6 , y=3

x =7 , y=1

x =4 , y = 4

10,2

2,1

10,1

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