You will need to move the decimal
Answer:
21/7
Step-by-step explanation:
Answer:
cos 90°
Step-by-step explanation:
(cos 60°)(cos 30°) − (sin 60°)(sin 30°)
= cos ( 60° + 30°)
= cos 90°
<span>obtuse angle is greater than 90 degree
acute angle is less than 90 degree</span>