
reference angles
I need to complete these problems and i need to get a perfect or if not ill fail precal 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!

COT is negative in Q2 and Q4
COT 100 = COT 280
SIN is positive in Q1 and Q2
SIN 290 = SIN 70 = SIN 110
CSC = 1/SIN
CSC 140 = CSC 40
SEC = 1/COS
COS is negative in Q2 and Q3
SEC 133  SEC 227