SOLUTION: Find the exact values 1. csc240° 2. cos270° 3. cos 3π/4 4. cot 3π/2 Can you please help me out and show the steps because it would really help me understand, thank

Algebra ->  Trigonometry-basics -> SOLUTION: Find the exact values 1. csc240° 2. cos270° 3. cos 3π/4 4. cot 3π/2 Can you please help me out and show the steps because it would really help me understand, thank       Log On


   

Question 926575: Find the exact values
1. csc240°
2. cos270°
3. cos 3π/4
4. cot 3π/2
Can you please help me out and show the steps because it would really help me understand, thank you very much in advance:)
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Find the exact values
1. csc240°
reference angle of 240-180=60˚ resides in quadrant III where cos<0,sin<0
csc240˚=1/sin240˚=1/sin60˚=-1/(√3/2)=-2/√3=-2√3/3
..
2. cos270°=0
..
3. cos 3π/4
reference angle of π-3π/4=π/4 resides in quadrant II where cos<0,sin>0
cos(3π/4)=cos(π/4)=-√2/2
..
4.cot 3π/2=cos(3π/2)/sin(3π/2)=0/-1=0