# Need help fast!

• May 6th 2008, 01:00 PM
NeedHelp18
Need help fast!
I need to complete these problems and i need to get a perfect or if not ill fail pre-cal and have to take summer school! help please. Thanks a million!

Express each function as the function of a reference angle.
(in degrees)

cot 100

sin -290

csc 140 ( can someone help me do this one?? I have no clue)

sin 8pi/11

II. Find the value of each function.
(its in degrees)

cos 30

sec 133 ( can someone help me how to do this one?)

Thanks!
• May 8th 2008, 01:28 PM
Moo
Hello,

Now that I know what a reference angle is, I can help (Giggle)

Quote:

Originally Posted by NeedHelp18
I need to complete these problems and i need to get a perfect or if not ill fail pre-cal and have to take summer school! help please. Thanks a million!

Express each function as the function of a reference angle.
(in degrees)

cot 100

sin(80)=sin(100)
cos(80)=-sin(100)

Hence it is not cot 80 ;)

Quote:

sin -290
Ok.

Quote:

csc 140 ( can someone help me do this one?? I have no clue)
140 is in the second quadrant. Hence, its reference angle will be 180-140=40.
sin(40)=sin(140)
Hence, csc(40)=csc(140)

Quote:

sin 8pi/11
Ok.

Quote:

II. Find the value of each function.
(its in degrees)

cos 30