1. were                                   

2. felt                          

3. had been                 

4. would finish

5. would come                       

6. had                         

7. had left                   

8. had come

9. would come                       

10. had given

D

A

A

D

C

C

B

A

B

A

D

Ta có   

AH2=BH.HC=1.2=2⇒AH=√2AH2=BH.HC=1.2=2⇒AH=2 ( hệ thức lượng)

AC2=CH.BC=2(1+2)=6⇒AC=√6  ( hệ thức lượng)

⇒

sinC=AH/AC=√2√6=√33sinC=AHAC=26=33

tanB=AH/BH=√21=√2