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

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

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22 questions

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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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