Need help ASAP PLEASE Which two have values located between 20 and 21 on a horizontal number line?
3
9
6.5π
9π

Tina practice piano for 15 hours last month and 45 hours this month use multiplication to write a statement comparing me i was tina practice during the two months use addition to write a statement comparing the hours tina practice during the two months

What is the missing step in this proof ?

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me