# Math Help - Need help fast!

1. ## 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
my answer: cot 80

sin -290
my answer:sin 70

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

(in radians)

sin 8pi/11
my answer: sin 3pi/11

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

cos 30
my answer: sqrt.3/2

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

Thanks!

2. Hello,

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

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
my answer: cot 80
sin(80)=sin(100)
cos(80)=-sin(100)

Hence it is not cot 80

sin -290
my answer:sin 70
Ok.

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)

sin 8pi/11
my answer: sin 3pi/11
Ok.

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

cos 30
my answer: sqrt.3/2
Ok.

sec 133 ( can someone help me how to do this one?)
sec(133)=1/cos(133) ~ -1.466