okay i keep gettin these off-the-wall answers and am now starting to get fustrated because I got these other 30 right except these 2. so can someone please help me, I'd really appreciate it.
Evaluate each of the inverse trig functions in radians rounded to 4 decimal places
1) By definition, arccot(-1/2) = A means cot(A) = -1/2. Then tan(A) = -2, sp arctan(-2) = A.
Plug this into your calculator, making sure the "mode" is set to "degrees" or "radians", depending upon the form required by your assignment.
2) This one works just like the previous one.
The range of inverse tan is, by definition, approximately (-1.5708, 1.5708). BUT ..... the range of inverse cot is, by definition, approximately (0, 3.1416) (see Inverse Trigonometric Functions).
So when using the technique suggested in this thread to get inverse cot, you have to add pi (approx 3.1416) to your answer.
Alternatively (and probably more simply), you can just use the well known relationship .
To the OP: You may not have got the correct answers in time for your homework but hopefully you've now learned something (which in the long run is much more important).