CMR 0 00 00 0COS10 .COS50 =4COS10 .COS50 =4

bài 4 - DE THI HOC KY 2 MON TOAN LOP 10 (CO DAP AN) SO 25
DE THI HOC KY 2 MON TOAN LOP 10 (CO DAP AN) SO 25

Bài 4b: CMR

0

0

0

0

0

0

cos10 .cos50 =4