I have tried on 2 calculaters and keep getting the wrong answer and was hoping s

Question

I have tried on 2 calculaters and keep getting the wrong answer and was hoping someone could tell me why. For tan-1(-.352/-2.57)= I keep getting 7.8 degrees and the answer is supposed to 187 degrees. Can someone please tell me how to calculate to get the 187 degrees? I have tried on 2 calculaters and keep getting the wrong answer and was hoping someone could tell me why. For tan-1(-.352/-2.57)= I keep getting 7.8 degrees and the answer is supposed to 187 degrees. Can someone please tell me how to calculate to get the 187 degrees?

Explanation / Answer

tan-1(-.352/-2.57) = 7.8 degree counter clockwise with the negative x- axis                     (or) 187.8 degree counter clockwise with the positive x- axis

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