$$\tan x;\ \cot x\ne\pi$$

$$\tan\left(x+\pi\right)=\tan x$$ $$\cot\left(x+\pi\right)=\cot x$$ CÒN LẠI ÂM

$$\cos\left(\alpha-\beta\right)$$

$$=\ \cos\alpha\cos\beta+\sin\alpha\sin\beta$$

$$\sin\left(\alpha-\beta\right)$$

$$=\ \sin\alpha\cos\beta-\cos\alpha\sin\beta$$

$$\tan\left(\alpha+\beta\right)$$

$$\frac{\tan\alpha-\tan\beta}{1+\tan\alpha\tan\beta}$$

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

$$\cos\alpha\cos\beta$$

$$\frac{1}{2}\left[\cos\left(\alpha+\beta\right)+\cos\left(\alpha-\beta\right)\right]$$

$$\sin\alpha\sin\beta$$

$$-\frac{1}{2}\left[\cos\left(\alpha+\beta\right)-\cos\left(\alpha-\beta\right)\right]$$

$$\sin\alpha\cos\beta$$

$$\frac{1}{2}\left[\sin\left(\alpha+\beta\right)+\sin\left(\alpha+\beta\right)\right]$$

$$\cos\alpha+\cos\beta$$

$$2\cos\left(\frac{\alpha+\beta}{2}\right)\cos\left(\frac{\alpha-\beta}{2}\right)$$

cos - cos = trừ 2 sinsin

sin + sin=2sincos sin - sin= 2cossin

$$\tan\alpha+\tan\beta$$

$$\frac{\sin\left(\alpha+\beta\right)}{\cos\alpha\cos\beta}$$ Trừ thì thay dấu bên trong

$$\left(\sin x+\cos x\right)^2$$ trừ thì thay dấu bên trong

$$\sin\alpha+\cos\alpha$$

$$=\sqrt[]{2}\sin\left(\alpha+\frac{\pi}{4}\right)$$ Trừ thì thay dấu bên trong

$$\forall x\in D\Longrightarrow-x\in D\ $$ $$f\left(x\right)=f\left(-x\right)$$

$$\forall x\in D\Longrightarrow-x\in D$$ $$-f\left(x\right)=f\left(-x\right)$$

TOÁN LOZ Thẻ ghi nhớ

Student preview

22 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Trục Oy

Back

Trục sinx

2.

FLASHCARD QUESTION

Front

Trục Ox

Back

Trục cosx

3.

FLASHCARD QUESTION

Front

Hai góc đối -> cos đối (dương)

Back

4.

FLASHCARD QUESTION

Front

Hai góc bù nhau -> Sin bù (dương)

Back

5.

FLASHCARD QUESTION

Front

Hai góc phụ nhau -> phụ chéo; đổi chỗ

Back

6.

FLASHCARD QUESTION

Front

Back

7.

FLASHCARD QUESTION

Front

Back

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