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I. In Radian Mode
1. Evaluate 
Ans.: 
Ti-85 [2nd] [COS] => [COS-1]
[2nd] [EE] => [x-1] 
[2nd] [(-)] => [ANS]
Evaluate [COS-1]
[(] [x-1] 2 [
]
2 [)] [ENTER] => 0.7853... Rads
Or 
[
]
[ANS] => 4, so 
2. Evaluate 
Ans.: 
Ti-85 [2nd] [COS] => [COS-1]
[2nd] [(-)] => [ANS]
Evaluate [COS-1]
[(] 1 [
]
2 [)] [ENTER] => 1.0472... Rads
Or 
[
]
[ANS] => 3, so 
3. Evaluate 
Ans.: 
Ti-85 [2nd] [SIN] => [SIN-1]
[2nd] [EE] => [x-1]
[2nd] [(-)] => [ANS]
Evaluate [SIN-1]
[(] [x-1] 3 [
]
2 [)] [ENTER] => 1.0472... Rads
Or 
[
]
[ANS] => 4, so 
4. Evaluate 
Ans.: 
Ti-85 [2nd] [TAN] => [TAN-1]
[2nd] [EE] => [x-1]
[2nd] [(-)] => [ANS]
Evaluate [TAN-1] [(] [x-1] 3 [)] [ENTER] => 1.0472... Rads
Or 
[
]
[ANS] => 4, so 
5. Evaluate 
Ans.: 
Ti-85 [2nd] [COS] => [COS-1]
[2nd] [(-)] => [ANS]
Evaluate [COS-1] [(-)] 1 [ENTER] => 3.142... Rads
Or 
[
]
[ANS] => 1, so 
6. Evaluate 
Ans.: 
Ti-85 [2nd] [COS] => [COS-1]
[2nd] [(-)] => [ANS]
Evaluate [COS-1] 0 [ENTER] => 1.5708... Rads
Or 
[
]
[ANS] => 2, so
II. Degree Mode (Degree Mode
shows angles in Degree -
Radian Mode Recommended)
7. Evaluate 
Ans.: 
Ti-85 [2nd] [TAN] => [TAN-1]
[2nd] [EE] => [x-1]
[2nd] [(-)] => [ANS]
Evaluate [TAN-1] [(] [x-1] 3 [)] [ENTER] => 60 Degrees
8. Evaluate 
Ans.: 
Ti-85 [2nd] [COS] => [COS-1]
Evaluate [COS-1] [(-)] 1 [ENTER] => 180 Degrees
9. Evaluate 
Ans.: 
Ti-85 [2nd] [SIN] => [SIN-1]
Evaluate [SIN-1]
[(] 1 [
]
2 [)] [ENTER] => 30 Degrees
Note: incorrect entry: DO NOT DO THIS
Evaluate [SIN-1]
1 [
]
2 [ENTER] => 45 Degrees which is incorrect
When you do this you are
evaluating 
III Recommendations / Conditions
1. Use [(] and [)] liberally
2. arcsin x and
arccos
x only works for 
3. arctan x works for all values of x