Okay so here is the question

Each angle of A is between 0 degrees and 180 degrees. Which equations result in two different values for angle A ?

-sin A = .7071

-cos A = -.5

-sin A = .9269

-cos A = -.7071

-sin A = .8660

-cos A = -1

-sin A = 3/4

-cos A = 3/4

-cos A = -3/4

I would like how you got there as well ! thanks !