Hello,

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

sin(80)=sin(100)

cos(80)=-sin(100)

Hence it is not cot 80

Ok.sin -290

my answer:sin 70

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

sin(40)=sin(140)

Hence, csc(40)=csc(140)

Ok.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

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