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!