`sin(2x-π/3)+1=0`
`<=>sin(2x-π/3)=-1`
`<=>2x-π/3=-π/2=k2π`
`<=>x=(5π)/12+kπ (k \in ZZ)`
Có: `-2020π < (5π)/12+kπ < 2020π`
`<=> -2020 < 5/12+k<2020`
`<=>-2020-5/12 <k<2020+5/12`
`=> k \in {-2020;.....;2020}`
`=>` Có `4041` giá trị của `k` thỏa mãn.

C B B C A B D D A A C D C

D A B D B B A A A C 

celebratory

celebration

celebraty

marriage-married

golden

cosily

 gift-wrapping

 gift-wrapped

celebration-enjoyable

to come

going

to inform- not to accept

have

to persuade-to let-go

getting

catching

eat

waiting

Gọi \(M\left(x;y\right)\) là 1 điểm bất kì trên (E) \(\Rightarrow\dfrac{x^2}{16}+\dfrac{y^2}{9}=1\) (1)

Gọi \(M'\left(x';y'\right)\) là ảnh của M qua phép tịnh tiến \(\overrightarrow{v}\Rightarrow M'\in\left(E'\right)\) với (E') là ảnh của (E) qua phép tịnh tiến nói trên

\(\left\{{}\begin{matrix}x'=x+3\\y'=y-2\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x=x'-3\\y=y'+2\end{matrix}\right.\)

Thế vào (1):

\(\dfrac{\left(x'-3\right)^2}{16}+\dfrac{\left(y'+2\right)^2}{9}=1\)

Hay pt (E') có dạng: \(\dfrac{\left(x-3\right)^2}{16}+\dfrac{\left(y+2\right)^2}{9}=1\)

Chọn B

3cos2x + 10sinx + 1 = 3( 1 - 2sinx^2) + 10 sinx + 1

                                 = - 6 sinx^2 + 10sinx + 4

                                 = 2(3sinx + 1)(2- sinx)= 0

ý 2 là trên đoạn nào bn ? 

d d d a d a a d a b c a d c b a

1 Jill reminded John to do the washing up

2 The police ordered his men to search all the shops on that street

3 She blamed me for ignoring the notice about life-saving equipment

4 My aunt advised me not to argut with my father

5 Stella congratulated Jeff on having got an promotion at last

6 Kevin apoligized to Sarah for making her angry

7 The man warn his son to put down the gun

8 Ron denied being in the town on the night of the robbery

9 Ted promise to pay back the money at the end of that month

10 George encouraged Susan to send her story to the magazine

11 Natalie accused Tom of lying to her

D C D B C C C D A 

Sam puts up the decorations.

Five guests came to the party.

Molly and Sam play video games with their cousins

The family was celebrating too early. Dad's birthday was two months away.

relationship

celebration

married

golden

quietly

celebratory

refer

1. he dislike being called " the liar " => He dislike people..CALLING HIM THE LIAR.

2. The police are following the suspects => The suspects ..ARE BEING FOLLOWED BY THE POLICE.

3. She always expects to be admired by everybody => She always expects everybody..TO ADMIRE HER...

4. Someone stole his car two days ago => He had ..HIS CAR STOLEN BY SOMEONE TWO DAYS AGO..