$\frac{\sqrt{3}}{2} \cos 40°$

$\frac{1}{2} 20°$

$\sqrt{2}\cos 20°$

$\frac{\sqrt{3}}{2}40°$

48920

48620

48640

48720

$-\frac{5}{9}$

$-\frac{5}{6}$

$-\frac{9}{5}$

$\frac{9}{5}$

3y + 2x = -5

2x + 3y =-1

2y - 3x =1

3x + 2y =1

(-5,-3)

(5,-3)

(-5,3)

(5,3)

$3\cos A -4Co{s}^{3}A$

$4{\cos }^{3}A-3\cos A$

$3\sin A\hspace{0.17em}-4{\sin }^{3}A$

$4{\sin }^{3}A -3CosA$

4

6

3

2

$\frac{1}{2}$

2

$\frac{4}{13}$

$\frac{1}{4}$

$1n\left(\sqrt{x+1}\right)+c)$

${\tan }^{-1}(\sqrt{x}+1)+c$

$2 1n (\sqrt{x+1)}+c$

$2{\tan }^{-1}(\sqrt{x}+1)+c$

-3

3

-12

12

$\{x:-1 <x>7 \}$

$\{x : -1 \le x\ge 7\}$

$\{x:-1<x<3\}\cap \{ x: 3 <x<7\}$

$\{x: -1<x<3\}\cup \{x\hspace{0.17em}: 3 <x <7\}$

$\sin \left(\sqrt{x}\right)$

$-\sin \left(\sqrt{x}\right)$

$-\frac{\left(\sqrt{x}\right)}{\sqrt{x} }$

$-\frac{\sin \left(\sqrt{x}\right)}{2\sqrt{x}}$

$x^2+y^2 - 4x+ 14y =0$

$x^2+y^2-4x-14y=0$

$x^2+y^2+ 4x + 14 y = 0$

$x^2+y^2 + 4x-14y=0$

$-2\le p\le 2$

$-4<p\le 4$

$-2<p<2$

$-4\le p<2$

-1

0

1

$\frac{1}{2}$

$\frac{2}{g} \tan \alpha$

$\frac{2}{g} cot\alpha$

$\frac{2}{g}\tan \alpha$

$\frac{2}{g} cot\alpha$

2

$\sqrt{2}$

5

$\sqrt{5}$

504

210

126

84

$\frac{8}{3}$

3

8

$\frac{3}{8}$

1

-1

0

2

${\cos }^{-1}\left(\frac{1}{4}\right)$

${\cos }^{-1}\left(\frac{1}{2}\right)$

${\cos }^{-1}\left(\frac{1}{3}\right)$

${\cos }^{-1}\left(\frac{1}{5}\right)$

e

$e^{-1}$

$e^{+1}$

1

1110111

1111011

1110110

1101111

13

15

25

23

$A/B=A\cup B^{/}$

$A/B =A\cap B^{/}$

$A/B =A^{/} \cup B$

$A/B =A^{/}\cup B$