$$\frac{\sqrt{6}+\sqrt{2}}{4}$$  

$$\frac{\sqrt{6}-\sqrt{2}}{4}$$  

$$-\frac{\sqrt{6}+\sqrt{2}}{4}$$  

$$\frac{\sqrt{2}-\sqrt{6}}{4}$$  

$$-\frac{1}{7}$$  

$$-7$$  

$$\frac{1}{7}$$  

$$7$$   

$$\cos2a=\sin^2a-\cos^2a$$

$$\cos2a=1-2\cos^2a$$

$$\cos2a=2\sin^2a-1$$

$$\frac{3}{4}$$  

$$-\frac{3}{8}$$  

$$\frac{\sqrt{2}}{2}$$  

$$-\frac{3}{4}$$  

$$\frac{1}{2}$$  

$$-\frac{1}{2}$$  

$$\frac{1}{4}$$  

$$-\frac{1}{4}$$  

$$\frac{1}{16}$$  

$$\frac{1}{8}$$  

$$\frac{3}{16}$$  

$$\frac{1}{4}$$  

$$\frac{\pi}{6}$$  

$$\frac{\pi}{3}$$  

$$\frac{\pi}{4}$$  

$$\frac{\pi}{2}$$  

$$30^o$$  

$$45^o$$  

$$60^o$$  

$$120^o$$  

$$\frac{1}{2}$$  

$$\sqrt{2}$$  

$$\frac{\sqrt{2}}{2}$$  

$$-\sqrt{2}$$  

$$\frac{\sin x}{\cos x}$$  

$$\frac{\sin a}{\cos a}$$  

$$\frac{\sin2x}{\cos2x}$$  

$$\frac{\sin2a}{\cos2a}$$  

$$\sin^2x-\cos^2x=1$$

$$\sin^2x+\cos^2x=1$$

$$\sin^2x=1+\cos^2x$$

$$\cos^2x=\sin^2x-1$$

$$1+\cos^2x=\frac{1}{\tan^2x}$$

$$1-\cos^2x=\frac{1}{\tan^2x}$$

$$1+\tan^2x=\frac{1}{\cos^2x}$$

$$1-\tan^2x=\frac{1}{\cos^2x}$$

$$\cos\left(a+b\right)=\cos a.\cos b+\sin a.\sin b$$

$$\cos\left(a+b\right)=\cos a.\cos b-\sin a.\sin b$$

$$\cos\left(a+b\right)=\sin a.\cos b+\cos a.\sin b$$

$$\cos\left(a+b\right)=\sin a.\cos b-\cos a.\sin b$$

$$\sin\left(a-b\right)=\cos a.\cos b-\sin a.\sin b$$  

$$\sin\left(a-b\right)=\cos a.\cos b+\sin a.\sin b$$

$$\sin\left(a-b\right)=\sin a.\cos b-\cos a.\sin b$$

$$\sin\left(a-b\right)=\sin a.\cos b+\cos a.\sin b$$

$$2.\sin a.\cos a$$  

$$2.\sin2a.\cos2a$$  

$$2.\sin4a.\cos4a$$  

$$1-\cos^24a$$  

$$\cos2a=2\cos^2a-1$$

$$\cos2a=1-2\sin^2a$$

$$\cos2a=\sin^2a-\cos^2a$$

$$\cos2a=\cos^2a-\sin^2a$$

$$2\cos4a.\cos2a$$  

$$2\cos8a.\cos4a$$  

$$2\sin8a.\sin4a$$  

$$-2\sin4a.\sin2a$$  

$$\cos3a$$  

$$-\cos3a$$  

$$\sin3a$$  

$$-\sin3a$$  

$$\sin a$$  

$$-\sin a$$  

$$\cos a$$  

$$-\cos a$$  

$$\cot2x$$  

$$-\cot2x$$  

$$\tan2x$$  

$$-\tan2x$$  

Hàm số chẵn

Hàm số lẻ

Hàm số vừa chẵn vừa lẻ

Hàm số không chẵn không lẻ

y = sin x

y = cos x

y = tan x

y = cot x

$$x\ne k2\pi$$  

$$x\ne k\pi$$  

$$x\ne\frac{\pi}{2}+k\pi$$  

$$x\ne\frac{\pi}{4}+k\pi$$  

$$x\ne\frac{\pi}{2}+k\pi$$  

$$x\ne\frac{\pi}{6}+\frac{k\pi}{2}$$  

$$x\ne\frac{5\pi}{12}+\frac{k\pi}{2}$$  

$$x\ne\frac{5\pi}{12}+k\pi$$  

$$x=\pm\frac{\pi}{12}+k\ \frac{2\pi}{3}\left(k\in Z\right)$$  

$$x=\pm\frac{\pi}{4}+k2\pi\left(k\in Z\right)$$  

$$x=\pm\frac{\pi}{4}+\frac{k2\pi}{3}\left(k\in Z\right)$$  

$$x=\pm\frac{9\pi}{4}+\frac{k2\pi}{3}\left(k\in Z\right)$$  

$$x=\frac{\pi}{9}+\frac{k2\pi}{3}\left(k\in Z\right)$$  

$$x=\frac{5\pi}{9}+k2\pi\left(k\in Z\right)$$  

$$x=\pm\frac{\pi}{18}+\frac{k2\pi}{3}\left(k\in Z\right)$$  

$$x=\frac{\pi}{18}+\frac{k2\pi}{3}\left(k\in Z\right)$$
$$x=\frac{5\pi}{18}+\frac{k2\pi}{3}\left(k\in Z\right)$$  

$$x=-\frac{\pi}{18}+\frac{k2\pi}{3}\left(k\in Z\right)$$
$$x=\frac{7\pi}{18}+\frac{k2\pi}{3}\left(k\in Z\right)$$  

x = 140⁰ + k360⁰ và x = -100⁰ + k360⁰

x = -140⁰ + k360⁰ và x = 100⁰ + k360⁰

x = 140⁰ + k2π và x = -100⁰ + k2π

x = 80⁰ + k360⁰ và x = -40⁰ + k360⁰

$$x=a+k2\pi$$  

$$x=-a+k2\pi$$

vô nghiệm

$$x=a+k2\pi;\ x=-a+k2\pi$$

$$x=a+k2\pi$$  

$$x=-a+k2\pi$$  

$$x=\pi-a+k\pi$$  

$$x=a+k\pi$$  

$$u_{10}=-2.3^9$$  

$$u_{10}=25$$  

$$u_{10}=28$$  

$$u_{10}=-29$$  

$$d=\frac{11}{3}$$  

$$d=\frac{10}{3}$$  

$$d=\frac{3}{10}$$  

$$d=\frac{3}{11}$$  

$$ab=32$$

$$ab=40$$

$$ab=12$$

$$ab=22$$

$$u_1=6$$  

$$u_1=1$$  

$$u_1=5$$  

$$u_1=-1$$  

$$d=3$$  

$$d=2$$  

$$d=-2$$  

$$d=-3$$  

$$n=9$$  

$$n=10$$  

$$n=11$$  

$$n=12$$  

$$d=-3$$  

$$d=3$$  

$$d=5$$  

$$d=6$$  

$$S_{10}=-125$$  

$$S_{10}=-250$$  

$$S_{10}=200$$  

$$S_{10}=-200$$  

100

50

75

44

$$u_n=u_1+\left(n-1\right)d,\ \ \ \forall n\ge2$$  

$$u_{n+1}=u_n+d,\ \ \forall n\ge1$$  

$$u_5=\frac{u_1+u_9}{2}$$  

$$u_5=\frac{u_1+u_{10}}{2}$$  

$$n=6$$  

$$n=7$$  

$$n=8$$  

$$n=9$$  

$$u_2=-6$$  

$$u_2=6$$  

$$u_2=1$$  

$$u_2=-18$$  

1; 2; 3; 4; 5; ...

1; 2; 4; 8; 16; ...

1; -2; 4; -8; 16; ....

1; -1; 1; -1; 1; ....

$$u_6=160$$  

$$u_6=-320$$  

$$u_6=-160$$  

$$u_6=320$$  

$$u_{n+1}=u_n.q,\ \ \ n\ge1$$  

$$u_n=u_1.q^{n-1},\ \ \ n\ge2$$  

$$u_k^2=u_{k-1}.u_{k+1}$$  

$$u_{n+1}=u_1.q^n,\ \ \forall n\ge1$$  

8

9

10

11

$$\frac{35}{16}$$  

$$\frac{181}{16}$$  

2

121

403

404

405

406

$$q=4$$  

$$q=-4$$  

$$q=2\sqrt{2}$$  

$$q=21$$  

98

99

100

101

Có

Không

Không xác định được

4

5

6

3

SO và AD

MN và SO.

MN và SC

SA và BC.

Chéo nhau

Có hai điểm chung

Song song

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