I'm using a Sci Calc to find Inverse functions... I have no problem with sin cos tan...But I can't seem to get the right answer to, Y=Cot^-1(-.92170128)....I enter it as Tan^-1(1/-.92170128) and get -.826120119....The answer is supposed to be 2.3154724.....Calc must be in Rad...Can anyone tell my what my mistake is