Tìm đkxđ của hàn số sau

 y = \(\sqrt{sinx.cosx+2sinx-cosx-2}\)

Tìm txđ của hàm số sau 

a,  \(y=3tan\left(2x+3\right)\)

b, \(y=cot\left(\dfrac{x}{3}+\dfrac{\pi}{4}\right)\)

A, Inventor

A, Tổ chức tiêm phòng dịch cho trẻ em

 A, Ý thức của người tham gia giao thông

2, Chọn đáp án D

 ĐKXĐ:   x≠1 ; x≠3

Khi đó : \(\dfrac{x-5}{x-1}+\dfrac{2}{x-3}=1\)

\(\Leftrightarrow\dfrac{\left(x-5\right)\left(x-3\right)}{\left(x-1\right)\left(x-3\right)}+\dfrac{2\left(x-1\right)}{\left(x-1\right)\left(x-3\right)}=\dfrac{\left(x-1\right)\left(x-3\right)}{\left(x-1\right)\left(x-3\right)}\)

\(\Rightarrow\)  (x−5) (x−3) + 2 (x−1) = (x−1) (x−3)

\(\Leftrightarrow\) \(x^2-8x+15+2x-2=x^2-4x+3\)

\(\Leftrightarrow\) −8x + 2x + 4x = 3 − 15 + 2

\(\Leftrightarrow\) −2x = −10

\(\Leftrightarrow\)  x = 5 ( thỏa mãn ĐKXĐ )

Vậy  S = \(\left\{5\right\}\)

1, Chọn đáp án C.

Ta có: V= \(\dfrac{1}{3}\)S.h

  \(\Rightarrow\) 126 = \(\dfrac{1}{3}\)S.6

  \(\Rightarrow\) S = 126 : 2 = 63\(\left(cm^3\right)\)

2. All flights were cancelled because of fog

3. The computer is being used by Bill at the momment.

4. Designers are paid a lot of money.

5. When was your kitchen decorated?

6. These products have to be tested

7. Our conversations were being recorded 

8. How is this word pronounced?

9. Cars will be towed away left here by the police

10. The situation must be done before....

11. The concert has been postponed

12. A new supermarket will be built next year

13. Has the car been repaired by your father?

14. Bananas are exported to ...

15. Flowers can be found in....

1, Tìm txd của hàm số sau 

a, y = \(\sqrt{sinx-1}\)

b, y =\(\sqrt{\dfrac{1-sinx}{1+sinx}}\)

c, y = \(\dfrac{1+cosx}{sinx}\)