C

B

\(\dfrac{7}{16}\)

1. Linh's parents are very proud of him because he always gets good marks.

2. We were very interested in playing soccer when we lived in the countryside.

3.Didn't you want to sell the house last year ?

4.. He stops smoking to save money.

5.My brother doesn't drive more carefully than I am.

C

C

 The red dress is more expensive than the blue one 

j v?

vì\(\dfrac{\pi}{2}< x< 0\Rightarrow sin< 0\)

Ta có: sin²x + cos²x=1\(\Rightarrow\)sin²x=1-cos²x=1-\(\left(\dfrac{3}{5}\right)^2=\dfrac{16}{25}\Rightarrow\sin x=\dfrac{-4}{5}\)

\(\sin\left(\dfrac{\pi}{2}-x\right)=\sin\dfrac{\pi}{2}\times\cos x-\cos\dfrac{\pi}{2}\times\sin x\)

\(=1\times\dfrac{3}{5}-0\times-\dfrac{4}{5}\)

=\(\dfrac{3}{5}\)

C

B