Answer:

Step-by-step explanation:
Given: 

Theta lie in first quadrant.
Multiply both sides by 2

2theta lie in I and II quadrant.
is positive in I and negative in II quadrant.







Hence, The value of 
Answer:
9 hours
Step-by-step explanation:
1 chapter ≈ .5 hour
18 x .5 = 9
All but -1 <x <1
_____________
Answer:
hello
Step-by-step explanation: