Thread: Inverse cotangent on calculator.

Hello. This should be an easy one, but the answer I'm getting doesn't match the answer in my text book, so I just want someone to help me either confirm it as a misprint or show me what I did wrong:

The question is:

Evaluate the following with a calculator, give the answer in degrees rounded to two decimal places:



I get: -13.30 degrees

My text book says: 166.70 degrees

Thanks!

for angles in degrees ...

On my calculator, I entered:

This works for solving many other problems of this type... can someone explain why this is an exception?

For instance, if the problem were:



I could enter on my calculator:



And arrive at the correct answer: -15.30

Why does this apparently work for inverse cosecant but not inverse cotangent?

Originally Posted by JennyFlowers

For instance, if the problem were:



I could enter on my calculator:



And arrive at the correct answer: -15.30

Why does this apparently work for inverse cosecant but not inverse cotangent?

the ranges of these two inverses don't match up ...

range of inverse cotangent is from ... , quads I and II

range of inverse tangent is ... , quads I and IV

Thanks so much!