Answer:
Sorry I cant help But I think that well I dont know but if you have any other questions i can help you with I can.
Step-by-step explanation:
Answer:
1. No
2. Yes
3. No
4. Yes
Step-by-step explanation:
Hope this helped!
Step 1: Convert
, which is in radians into degrees. To convert it multiply by 

900/12
75
Step 2: 75 degrees isn't on the unit circle but 45 degrees and 30 degrees is. Since 45 + 30 = 75 you can use the cosine of 45 and 30 to find the exact value
cos45 = 
cos30 =
Step 3: Add the cos45 and cos30 to get cos5pi/12

Hope this helped!
Answer: -4.5714285714285714285714285714285714285
Step-by-step explanation:
8 times -4=-32/7=-4.5714285714285714285714285714285714285